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#1 |
Registered User
Join Date: Oct 2003
Location: biwabik, minnesota, what is this white stuff out here
Posts: 334
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gas milage
found out today around about what im gettin in gas milage, rite now im lookin at about 12 mpg with the tail gate off, filled up yesterday and then ran around till about empty and added it all up when i filled up again today,so rite now 12 aint to bad but i want to get alittle better then that,im thinkin about gettin a 700r4 and havein it rebuilt and havein another rearend put in under my truck,,, what are yall runnin and what are yall gettin for gas miliage
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#2 |
Try spinnin 4 rear tars
Join Date: Sep 2003
Location: Salt Lake City, Utah
Posts: 757
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1/2 ton, LWB, 2wd, 327ci with 2-barrel carb and points ignition, 350 tranny, and 3.08 rearend. running 255-70R15 tires. I get 13-14 doing 75 down the road, and about 14-15 in town. If I cruise doing 50-60 I can get close to 20mpg.
And that's with my tailgate closed ![]()
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SWEET7T 1970 C10, 2wd, LB, 307/TH350/3.08. PS, PB |
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#3 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,646
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Most of my miles are in town, short trips, and include warm-up (choke on) time. I haven't checked my fuel mileage in many years (I don't actually get mileage, I get yardage!). But when I took a 3500 mile trip a long time ago, I averaged 11 mpg with a camper shell on my lwb K20, 4:10 gears. Oh yeah, that was winter & included a few hundred miles of locked-in 4wd (Rockies etc).
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#4 |
Registered User
Join Date: Apr 2004
Location: Booneville Mississippi
Posts: 8
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haha, i hear that, i hardly drive far off, with the v8 and all.
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Supreme Konceptz car club Booneville MS 1978 GMC Seirra Classic 305 bored .30 over primer grey soon to be ground scraping ![]() ![]() ![]() |
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#5 |
Registered User
Join Date: Oct 2003
Location: biwabik, minnesota, what is this white stuff out here
Posts: 334
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im runnin a stock 350, edelbrock 650, headears, hei, turbo 350, not sure on the rear end but im runnin 255-60-15 out back,, i took a 142 mile trip and filled back up this mornin and thats how i figred out what im gettin, i put just over 12 gallons in and went from there
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#6 |
huh ???
Join Date: Nov 2002
Location: Fredericksburg,Va.
Posts: 3,369
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The last time I drove my truck it got around 3 mpg. 72 C/20 400 hp 402bb,700R4 trans without TV cable, 4:11 dana 60 rear...
Chuck
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90 Blazer Silverado 350w/ 700R4 and 32" Kelly's "I am a bomb technician. If you see me running try to keep up!" |
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#7 |
The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,477
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NOT AS BAD AS 72CUSTOM, BUT 8 MPG HERE - 400 SB W/ 4 BOLT
MAINS, 2 SPD. POWERGLIDE, EDELBROCK 750, VICTOR JR INTAKE, ACCELL WIRES, HEADERS, FLOWS, VELOCITY STACK, AND UNTIL LAST WEEK 3:73 REAR END WELDED, IT WENT CRASH @ 120 MPH
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Owner/Op: "TN Classic Transport Carriers" The Toy: "Square Vette" 72 Hybrid Blazer Toy Barn: "LuvShack" 40 x 60 x 20 Shop Tow Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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#8 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Try it again with your tailgate on and up, you may find that it has little to no effect on your MPG.
Also, if you do the 700R4, and if you have the 3.07 gear, your MPG will more likely than not drop. Some can get it to work with that combo, but my money will be on loss of mileage. |
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#9 |
Registered User
Join Date: Jan 2002
Location: North Carolina
Posts: 692
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Andy, Its kinda funny you mentioned that fact as I was just telling a buddy about there being no difference today.
I watched a show on TNN a few years ago and they took a compact, mid size, and a fullsize truck and put tailgate down, took it off , ran one of those net things, and then put a tonneau cover on it. The wind tunnel is what they used and the results showed there was no difference with the tailgate down or anything else as the wind still came in the bed and made a swirl whether tailgate was there or not. The one thing that did work though was a toneau cover as the wind could not get in. I wish I had of taped it because everytime I tell anyone about the results they just laugh and swear theirs gets better with tailgate down or off. Steve
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2008 Buick Enclave(wifes new non wrecked) 1996 Jeep Cherokee 2002 2500HD 6.0L (traded) 1998 Jeep Grand Cherokee(wifes/wrecked) 1977 DJ5 postal jeep(mmm lots of fun) 1988 Toyota 2wd p/u(DD, blewup 199,000) 1991 Toyota 2ed p/u (sry just cant break these things) 1997 XR70 Honda 1991 Z50(FOR SALE) 1972 Z50 Honda 1970 SWB 350/knucklebuster "The adventure begins and I am confident that there will be no end". |
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#10 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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I learned the hard way...no fuel guage, and i was shocked that my MPG was so pathetic being I had the same engein and tranny in a smaller and lighter truck with more freeway friendly gears. (took the eng/tranny out of the totalled longhorn and installed it in the SWB GMC) My MPG went from 14 combined, down to 9 combined. I dropped the tailgate expecting at least one MPG better, but I ran out of gas at the exact same point.
I fixed my fuel guage becouse it was easier than keeping track of my MPG every week. |
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#11 |
Registered User
Join Date: Feb 2004
Location: Massachusetts
Posts: 269
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After first round tuning I'm getting just about 13 mpg, but I found my float levels were way high, and I'm still changing over to synthetic fluids. So I hope to have better numbers as soon as my new axle shows up hopefully tomorrow. I also still need to find my ideal timing, and tire pressure, and may try a tonneau cover. Maybe I'm crazy, but I would like to get 18 out of this thing. 72 K10 350/TH350, 3.07, 35x12.5" tires, Carter AFB, mallory unilite ignition, and dual exhaust.
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72 Cheyenne Super 4x4 SWB |
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#12 |
Registered User
Join Date: Jun 2002
Location: central pa
Posts: 1,525
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Right now I get between 9.5 and 11.5mpg. 402bb/1411 edelbrock/th400/4.11 gears/9.50x16.5 bias tires. with the old Q-jet I averaged about 12mpg and a high of 14mpg. When I ran the q-jet I would get about 1/2 mpg better with the gate down than with it up and it actually dropped when the gate was off. This was not scientific just everyday driving back and forth to philly 125miles 1 way turnpike. I think I might try the q-jet again to see if it can still get 12 average.
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72 longhorn c30 502BB/th400/fact air/4.11rear/ custom camper 72 bug(the better half's) under reconstruction 2009 HHR aqua blue 71 GMC k20 350/sm465 2009 Chevy hd3500 6.6 Victory Red crew cab dually Dave & Jeanne |
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#13 |
hmm...
Join Date: Jan 2004
Location: Culver, Indiana
Posts: 1,631
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I can personally vouch for the effectiveness of a quadrajet. I went from a 2 bbl carter carb on our jeeps 258 to a 650 cfm holley and got about 16 mpg on the highway (as opposed to 18 mpg with the 2bbl). Threw on a 750 cfm quadrajet off of a Olds 350 and it got 21 mpg on the highway. Granted, these tests weren't done with any kind of control, it was just what I observed on different days with similar conditions (similar temps, no wind, etc). I'm sold on quadrajets, my 307 with a CCC 800 cfm qjet gets 25 mpg on the highway and 16 in town. Can't beat those dinky primaries and cavernous secondaries.
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1983 Oldsmobile Delta 88 1967 Chevy C-10 stripper www.fcrperformance.com - wanna go...faster? talk to FCR. |
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#14 |
Registered User
Join Date: Oct 2000
Location: St. Johns, Arizona
Posts: 2,660
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1972 K10 Suburban - 350, stock exhaust, weiand intake, q-jet, 700r4, 3.73 - 10-11mpg
1968 K20 - 350, sotck manifolds, q-jet, stick, 4.57 - 7mpg 1969 K10 - 350, stock intake, cheap-o headman headers, q-jet, stick, 3.73 - 19mpg 1999 K10 Suburban - 350, stock everything, port injection, 4l60e, 3.54 - 14mpg
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my 2¢ - t.i.o.l.i. Bowen 1968 K20 fleet 1969 K10 swb fleet 1972 K10 Suburban 1972 C10 lwb step 1992 K1500 'burb 1995 K2500 'burb 1997 C1500 'burb 1999 K1500 2000 K1500 'burb Why do I own so many Suburbans? |
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