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#1 |
1969 Custom 30 wrecker
Join Date: Sep 2001
Location: Pottsville, Pa
Posts: 2,611
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I finally got my speedometer set accurately (took 6 years to get myself to do it)
![]() Mine is a 1969 C-10 short stepside with a 74 350/2 bbl and turbo 350. Rear gears are 3.73 and the truck weighs 3700lbs. I could probably have squeezed a bit more out of it but a few irritating drivers made me get on it 2-3 times during this tank full! ![]() This is around town mainly. Im afraid to check the big highways as I know the 3.73's would kill mileage. ![]() So hows yours? (remember, accurate speedometer first)
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Bob 63 Impala 283/PG/3.36 (under restoration) 66 Impala 327/PG/3.36 66 Chevelle SS 409/M22/3.55 69 Chevelle 307/PG/3.08 (future restoration) 69 C10 short stepside 454/TH350/3.73 69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!) 71 Cheyenne 20 fleetside 350/4 spd/4.10 71 Chevelle 6/PG/3.08 72 Chevelle 454/M21/4.10 |
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#2 |
Senior Member
Join Date: Dec 2000
Location: Indiana
Posts: 3,074
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Speedo dead on. 18.4mpg average on highway and city. Running between 30-80 mph.
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71 Chevy CST Long Fleet 350/350/3.07 leaf rear. |
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#3 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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We get 15-16 miles to the gallon on the highway at 70 mph. 14
around town. Loaded or empty does not seem to matter. Jim |
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#4 |
Registered User
Join Date: Jun 2002
Location: Pleasanton, CA
Posts: 162
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Ok,
454, Th400, 411's, and 35's... I got 11 keeping it in the primarys for 150 miles. Around town 7-9 cleatus
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"What we are dealin' with here is a complete lack of respect for the law...." Beuford T. Justice |
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#5 |
Account Suspended
Join Date: Sep 2000
Posts: 4,002
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Mine seems to use gas even if its not running, and when it is running it uses even more. Plus I got 4:10's
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#6 |
Weapons Of Construction
Join Date: Apr 2000
Location: Colorado, USA
Posts: 1,095
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After keeping all the receipts with the miles written on them, I put them into excel. Hovering in the 10 to 11 mpg range consistantly. The pipes sound best when I'm standin' on it!!!
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1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO |
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#7 |
Registered User
![]() Join Date: Jan 2001
Location: Sabinal, Texas
Posts: 1,706
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I get 10 with the the 402.
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#8 |
Registered User
![]() Join Date: Jun 2003
Location: West Valley City, Ut
Posts: 311
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Oh Boy! How about 8 mpg in the city or on the highway, rolling tall or pulling a long haul.
But then again, it's 337,000 original miles on an mildly tired 350. We currently have 4:11's. on 40" Tires. |
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#9 |
Got 20's????
Join Date: Oct 2001
Location: Aberdeen SD
Posts: 1,451
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15.4 going 65 and 12.5 going between 80-100mph. 3.73's w/ overdrive.
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99 Silverado Ex-Cab 2wd, Bagged&WhippleCharged 02 Sierra Ex-Cab 4wd 2500 HD The 72 went down the road. |
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#10 |
Senior Member
Join Date: Aug 2002
Location: Valley Center KS
Posts: 3,525
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About 11 mpg. 3.08 gears, fresh rebuild, not to big of a cam. I gotta rejet this edelbrock carb, I think I could squeeze out a few more based on what everyone else is getting.
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#11 |
Registered User
Join Date: Jan 2003
Location: San Diego, CA
Posts: 98
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How do I check the accuracy of my speedometer? Would love to know (I think) what my gallons per mile is.
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67 Fleetside Shortie, small window, slip & slide tranny Upgrades--small block, tilt column, disc 5 lug conversion (front and rear), Future Projects--suburban gas tank under the bed, rear roll pan, better gas mileage (currently about 6-10 MPG) |
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#12 |
Registered User
Join Date: Nov 2002
Location: Kannapolis, NC
Posts: 552
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/me nods and uses 5 gallons per run on the 1/4 :grin: The ole 350 gets around 10, and im poor, so it dont get out much
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#13 |
Account Suspended
Join Date: Sep 2000
Posts: 4,002
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What kind of mileage can I expect out of a 6 cylinder 250?
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#14 |
Registered User
Join Date: Feb 2003
Location: Mesquite, Tx
Posts: 396
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MINE GETS ABOUT 20MPG. 3.54'S OUT BACK. TREMEC 5-SPEED AND TBI ON A 327
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GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd |
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#15 |
Registered User
Join Date: Mar 2003
Posts: 99
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I am lucky if I get 7-8 in town. The 4.11's and aftermarket stall do not help matters any. I have not driven it on the freeway since I got done working on it. It will probably rattle apart.
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http://photos.yahoo.com/cruzn72@pacbell.net |
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#16 |
now thats a true COON DOG
![]() Join Date: Nov 2000
Location: Franconia, NH
Posts: 1,977
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Just started up my freashy rebuilt 402 tonight so I'm not sure what I'll get for mileage or what to expect.... But I'm really hoping for 10 mpg...
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current project 67 ![]() 71 SWB Stepside, was a 250, now is a 402 Big Block with 4 speed and 3.73's ( was crushed by a tree, bed sold, motor pulled) ![]() 72 LWB 4x4 350 4-speed 3.08's posi wearing army olive drab green (SOLD!) 68 BURB 50TH LOOKALIKE work in progress, soon to have 250-I6 with a 3-speed on the tree 4.11's and posi ( currently sitting in back yard tarped awaiting time, $$$, and lots of love!) 67 1 TON- work truck 396 sm 420 4-speed, flat bed 4.57 gears "big red" (my first landscape truck, very rusty and crusty! but still gets the job done when needed!) |
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#17 |
newly minted old timer
Join Date: Dec 1999
Location: Hudson WI
Posts: 3,511
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poor mans way of checking speed go. go up to the highway and put it at 60mph. get the passenger to start a stopwatch when you pass a mile marker.. keep it at 60 till you hit the next marker.. should be 60 seconds.
i seem to be getting 10 or so with my 350 auto trans..373s... i did get 17 when i moved to texas .. that was on the highway at 50.. wish i could get that all the time.
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____________________________________________ 72 c20 longhorn 65k org miles and counting! 69 k10 Suburban |
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#18 |
SKINNY TIRES RULE!
Join Date: Sep 2001
Location: Bothell, WA
Posts: 11,049
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My speedo is way, way off. But I'm estimating in the 6-8 mpg. My carb is a little messed up though. I've got another doner that I'm going to rebuild and see if it works better.
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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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#19 |
Registered User
Join Date: Jan 2000
Location: Tulsa, Oklahoma
Posts: 498
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Jayssun, check your speedo against a portable gps.
Cheers Richard
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Broken Arrow, OK. 1977 Corvette, ZZ4 Crate, new interior, new suspension, new driveline, you get the picture, (new project / daily driver) |
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#20 | |
14.1 @ 96MPH
Join Date: Jul 2001
Location: Mesa, AZ
Posts: 2,811
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Quote:
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Project1970 - LS1 Swap Complete! ![]() |
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#21 |
THE QUICKER FIXERUPER
Join Date: Jul 2002
Location: Ok
Posts: 615
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I get about 8 mpg with my non stock 327
![]() Gee_Emm I got 11 out of my 250 with same gears |
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#22 | |
Registered User
Join Date: Feb 2003
Location: Mesquite, Tx
Posts: 396
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Quote:
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GM 330HP/350, Magnuson 122HH, Tremec TKO 5spd |
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#23 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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13 mpg going 75 on the highway. 350/350/3.07 gears. It would proably get 14-15 if i were to keep my foot out of it and drive 60-65 mph.
I don't have to warm up my truck very much at all. I have my electric choke tuned pretty good, so i pretty much start it up, put it in gear and drive off. It may die every now and then if it has only run for 10 seconds, but usually goes just fine. From my experience, electric chokes work great, but the old divorced choke Q-jet i had worked like crap, and i had to sit around and warm it up.
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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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#24 | |
Hot Damn - Here I Am!!
Join Date: Feb 2000
Location: Ringgold, Georgia
Posts: 726
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Quote:
My advice is to go with the V8 Gee_Emm. Robert
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My vehicles: '90 Silverado Sport '71 Chevelle SS Convertible '70 C-10 - My Grandfather bought it new - original un-restored |
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#25 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Gas mileage!-what's that? (3.07 with a 502)
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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