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06-10-2002, 01:31 PM
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#1 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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Whats your engine specs and gas mileage?
With .030" over 350 with sportsman 2 heads 200cc intake ports, 10.2:1 compression, 36 degrees total timing, air gap rpm intake, 800 cfm edelbrock eps carburetor , HEI, .492" lift at 234 duration cam, 1 1/2 inch headers into dual 3" exhaust all in all maybe 420 HP and about 1200 miles on the whole package, and 285/75-16 tires with 3.54 gears( maybe 3.73 ) and a close ratio 4 speed manual all wrapped up in a 4300 lb 1968 heavy 3/4 ton truck I get an astounding...
9.3 mpg in the city 12 mpg on the highway How about you?
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No truck :-( |
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06-10-2002, 01:46 PM
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#2 |
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CCRider
Join Date: Feb 2000
Location: Olive Branch,MS,USA
Posts: 2,232
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I have a bone stock Mr. Goodwench 350 with a Edelbrock performer intake and carb. It gets
10 mpg city 10 mpg highway 10 mpg uphill 10 mpg downhill 
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72 GMC Sierra SWB almost finished---- 84 Softail Olive Branch MS |
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06-10-2002, 01:56 PM
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#3 |
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Recovering Truck Driver
Join Date: Mar 2002
Location: Orleans, NE USA
Posts: 1,883
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My engine is a 350 bone stock except bored .030....in a 72 K-10 averages 12mpg
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska |
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06-10-2002, 02:03 PM
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#4 |
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SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,038
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Mine is a 350 with mild build. I don't know what all was done to it since it was like this when I got it. It definatly has a cam and headers but that's all I know for sure. I get about 6-8 mpg but I think it is the 35" tires that kill most of my MPG.
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bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L |
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06-10-2002, 02:04 PM
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#5 |
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14.1 @ 96MPH
Join Date: Jul 2001
Location: Mesa, AZ
Posts: 2,811
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Start with one weak old 1970-original 122,000 mile old 350...add in a mild cam, ghetto dual exhaust, HEI, and an extremely-overkill K&N...get the power down with a TH400 and 3.73 rearend...
Results: Mid-to-low sixteens in the quarter, just short of 10mpg anywhere. I've already got a 700R4 lined up...just need to put it in...
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Project1970 - LS1 Swap Complete!
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06-10-2002, 02:06 PM
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#6 |
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Transcendental Trucker
Join Date: Dec 2001
Location: Rockaway Beach, OR
Posts: 374
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Stock 350 except for an Edelbrock 600 CFM carb and ram's horn manifolds - 12ish.
Actually, since yesterday, I'm getting very good mileage - in fact, I'm not burning any gas at all! Amazing what not having a tranny will do for ya.. :p
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Patrick Sullivan | sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all! |
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06-10-2002, 02:15 PM
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#7 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Stock 307 with Q-Jet, 3:07 rear end, 71 long box. 16-16.5 highway under 70 mph, (over 70, mileage deteriorates badly).
Loaded it drops to 15-15.5 if you keep it under 70. Around town it gets 14 or a little over. Jim |
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06-10-2002, 02:35 PM
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#8 |
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Registered User
Join Date: Apr 2000
Location: Freeland,Michigan,USA
Posts: 312
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20 mph, stock I6, with headers, hei, and overdrive. Never had the 6 apart !
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1968 SWB Stepside, 250,pwr disc brake and tilt pwr steering, 5 spd tranny, HEI,Accel coil,K&N filter,Seat from a later truck with built in seatbelts, front and rear sway bars, moved gas tank to under the bed, headman hedders, new chrome bumpers,one wire alternator,Weber k550cub carburator...WORK IN PROGRESS, Freeland MI , Just bought a 72 Jimmy!!!!!!!!!!! |
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06-10-2002, 02:49 PM
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#9 |
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I poop on Ford!
Join Date: Apr 2002
Location: Houston Area
Posts: 295
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See the sig for the build.
I'm with Tom Hand, I get 9-10mpg no matter what kind of driving I'm doing even with the damn top off and the tail gate down.
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1972 Chevy Cheyenne - LWB, factory 402BB 2005 Chevy Suburban LT 2006 Chrysler 300C - SRT8 |
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06-10-2002, 03:17 PM
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#10 |
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Livin' it up.
 
Join Date: Nov 2001
Location: Richland, MI
Posts: 2,212
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build is in the signature. it's got stock heads that are 98cc and i still think it's compression is pretty low. I get 10mpg, whether i baby it anywhere or whehter i drive it 90-140 on the fwy. it doesnt care. big blocks are like that i'm told...
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-Greg; Sold the 69 C20. It's off to a better home with more love! Now onto the 86 CUCV M1009; K5 blazer with 6.2L diesel, corp 10 bolt axles, Detroit locker in the rear, trutrac front, 3.73 gears, 35" tires. 
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06-10-2002, 03:25 PM
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#11 |
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Seņor Member
Join Date: May 2002
Location: Edge of the world
Posts: 5,367
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You check your mileage? I just fill the thing up when it gets low, and pay the humongous gas bill every month
 But, like tom hand... I think I get 10 empty, loaded, up hill, sitting in garage, whatever. Oh... and this is a 250 with a 1 bbl. Kenneth
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Last edited by XXL; 06-10-2002 at 03:30 PM. |
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06-10-2002, 04:17 PM
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#12 |
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Registered User
Join Date: Apr 2000
Location: Missouri
Posts: 469
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107,000 on an origional 350, and I have gotten between 12 and 19. Stock rear end and 3 on the tree.
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Never tire of doing what is right II Thess. 3:13 Northeast Missouri 71 LWB original 350 3/speed Soon to be 500 |
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06-10-2002, 04:17 PM
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#13 |
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Registered User
Join Date: Jan 2002
Location: cornville, maine
Posts: 659
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My 1970 C30 402 auto longhorn gets 15(at 60-65 mph) on the highway, and 12 around town, 4.10 rear, t400, the longhorn is all stock, except an HEI and headers/glasspacks. and my 68 2 wd drive burb gets 18 highway(65 mph), 16 in town. It is almost stock, but a newer 350 with unknown, but high compression heads, performer intake, Qjet, HEI with an sm465, and 3.07 rear, 31 inch tires. It has ?10.5:1? CR. It is stifled by a puny single exhaust system, and if I go much over 65, the fuel mileage goes down exponentially.
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jku Cornville, Maine 68 C10 burb 42 Willys MB 46 Dodge WF-32 1.5 ton 53 & 56 Olds' 60 Cadillac 22 Dodge Brothers |
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06-10-2002, 04:30 PM
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#14 |
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Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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350, bored .060 over, cast flattop pistons, stock heads w/76cc chambers, Edelbrock Performer intake, Headers, 2.5" dual exhaust with Flowmasters, 204/214 duration cam with .443/.444 lift, HEI, Edelbrock 1406 carb. It has a TH350 and 3.07 gears for the rest of the drivetrain. I get 10mpg around town, and 12mpg on the highway. When it had a proplery working Qjet on it, i got 13.1 mpg around town, and im not sure on the highway, proably close to 16. But when my Qjet stoped working properly, i couldn't afford a new Qjet, so i bought the 1406. The truck runs alot better, has a little more power, but the gas mileage droped. I'm hoping to get a 700R4 in it this summer, and i might add some 3.73's if i can find a decently priced rearend with those gears....
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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06-10-2002, 04:33 PM
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#15 |
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Used to have a truck
Join Date: May 2002
Location: port orchard WA
Posts: 1,552
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JKU72...
18mpg on a suburban and 15 mpg on a one ton big block with 4.10 gears? You must have one of those magnetic thingies that clamps to your fuel line and points the fuel molecules towards Mecca or one of those air cleaners that induces a manmade tornado in your carburetor. I was happy to get 18mpg on the highway with my 6 cylinder 3 speed 69 C10.
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No truck :-( |
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06-10-2002, 04:43 PM
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#16 | |
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Seņor Member
Join Date: May 2002
Location: Edge of the world
Posts: 5,367
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Quote:
 BTW, I've just run a mileage simulation on the Suburban config, and with a 3 mil application of Vaseline to the front bumper, it looks like we can squeeze another 1/2 mpg out of it. But the law of diminishing returns kicks in pretty quickly... if we coat the entire front end of the 'Burb, we only get another 1/4 on top of that, but at the cost of 3 quarts of petroleum jelly and a 55 gallon drum of degreaser when we want to de-lube the front end for car shows.  {smarta$$ mode off, as if that's actually possible to do} Kenneth
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06-10-2002, 04:58 PM
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#17 |
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Goodbye Darlin'
Join Date: Nov 2001
Location: Coupeville, WA USA
Posts: 330
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400SB, 60 over, 12mpg H-way
TH350, Holley 4BBL, Lead foot
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1971 Blazer CST SOLD! |
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06-10-2002, 05:06 PM
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#18 |
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Strongman Garage
Join Date: Apr 2000
Location: Salinas, CA
Posts: 10,241
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stock 350 with headers and edelbrock intake, Qjet, 3:07 rearend..... 14-17
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Kalle 68 GMC Suburban 1500 4x4 SOLD 69 Pontiac Lemans 99 Silverado 4.8 5 speed ECSB [ Facebook Instagram Subscribe on YOUTUBE |
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06-10-2002, 08:11 PM
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#19 |
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Big Block Power
Join Date: Jan 2001
Location: Jersey
Posts: 178
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The 69 gets about 8 mpg if i baby it, 4 mpg if i run it hard, which is most of the time. the blazer gets 14 on the highway and about 11 around town. I drove the 69 down the shore ( about 50 miles) each way, and had to stop for gas on the way home, but the 50 mile trip only took me about 35 min.
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06-10-2002, 08:30 PM
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#20 |
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Gasser
Join Date: May 2000
Location: Thomasville,NC USA
Posts: 456
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'70 350, over 30. 462 heads, fully ported. 292 cam. 1.6 rollers. Flat tops. '70 LT-1 intake... ported to match. 1 5/8 Alumicote headers... ported to match. 650 Holley (started life that way anyhow) M-21. 390 gear. Work and back I can get 16 MPG. (country roads, tach 2000, cruise at 45 mph.) Highway, about 12. Driving with foot in it, 10 or so.
Stepside
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:thud 70 sstep tubbed, Muncie, double hump, snowflake, |
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06-10-2002, 09:16 PM
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#21 |
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Registered User
Join Date: Jan 2001
Location: Killingworth, CT. USA
Posts: 3,378
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350, 30 over 9 to 1 flat tops, 194 stock heads, RV cam by Speedpro, line bored, decked, 600 cfm Edelbrock with performer intake bolted up to a 700R4 turning a posi 3:73 rearend with 255/70R15 sneakers and traveling light at 55 mph it gives me 19-20 mpg. When it had the Turbo 350 it was giving me 14-15 mpg at best.
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1971 C10 swb stepside 350/700R4/3.73posi (retired as of 4/22/03) 1998 S10 short bed 2002 S10 Blazer 1942 Oldsmobile 1958 Massey Harris Pony 1951 Wife Killingworth, Connecticut May those who love us, love us, any of those who do not love us, may God turn their hearts. And if God is unable to turn their hearts, may he turn their ankles so we may know them by their limping. A man who works with his hands is a laborer; a man who works with his hands and his brain is a craftsman; but a man who works with his hands and his brain and his heart is an artist. |
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06-10-2002, 11:15 PM
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#22 |
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Registered User
Join Date: Apr 2001
Location: Fallon, NV
Posts: 24
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And the survey says
10MPG, loaded/unloaded/uphill/downhill/sitting in the garage/or driving cross country. But this little Rocket 350 2wd out pulls every furd it has came across.
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06-10-2002, 11:27 PM
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#23 |
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Registered User
Join Date: Aug 2001
Location: Jesup, GA
Posts: 571
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I get 8-10mpg.
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06-10-2002, 11:32 PM
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#24 |
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Senior Member
Join Date: Apr 2002
Location: Help! I'm in an office park with its own network of freeways!
Posts: 470
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10 city, 13 highway for the truck. Build is in the signature.
The bus gets 5. Period.
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'67 C20--427 tall deck/SM420, 4.10 HO52 (Michigan has not been kind to the Old Man) '95 Caprice--355 LT1/T56/3.42 8.5" 10-bolt (daily driver, almost 300k on the chassis) '07 Outback--wife's car. 125k & counting. No head gasket or transmission issues yet. *fingers crossed* |
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06-11-2002, 02:44 AM
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#25 |
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No, U Da Man!
Join Date: Mar 2001
Location: Southaven, MS
Posts: 284
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12-13 mpg to work and back everyday.
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(sold ole blue 1972)  1997 Dodge 1500 5.9L 1996 Saturn SL2 1.9L 2002 Mitsubishi Montero 3.0L 2005 Ford Escape 3.0L 1967 Olds Vista Cruiser 330-320HP |
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