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03-19-2009, 11:24 PM
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#1 |
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Registered User
Join Date: Apr 2007
Location: Newton, IA
Posts: 173
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Re: is 10 mpg normal?
My 1971 c10 with stock '76 350/turbo 400 combo, stealth intake, a 600 holley single pump, 3.08 gears, and 31 inch tall tires got avg at 65mph about 24 mile per gallon. What i have now with about 350 solid HP and 380ftlb of torque, 9.3:1 comp, 280 isky cam, air gap intake, and tuned Q-jet is like 14mpg at about 65mph. I say call competition products and talk to one of the Isky techs or call Isky and ask about the economizer cam profiles, you'd be really surprized! My 2 cents.
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FAST cars don't make power to the front wheels, THEY LIFT 'EM! |
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03-20-2009, 05:04 AM
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#2 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: is 10 mpg normal?
24 MPG?
How many tanks of gas did you go through to get this number? Is your speedometer acurate? I ain't trying to call you a liar, but that's way too high. Ppl with fuel injected 4.3 V-6 engines can't get that much in a classic truck Last edited by Longhorn Man; 03-20-2009 at 04:38 PM. |
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03-20-2009, 06:14 AM
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#3 |
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The LuvShack Garage
Join Date: Jan 2004
Location: Maple Grove, TN (West Side)
Posts: 30,475
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Re: is 10 mpg normal?
Before I dismantled "GQ" to build "YFTSB" I was getting 6-8
with 35" tires, 350 turbo tranny and 3.08's  I guess the PO wasn't lying about his baby having a performance motor.
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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 Big Piggy: "Goliath" 07 Kodiak C4500 Lil Piggy:"Maddy" 88 Silverado 3500 Hauler: "Feathers" 14 Aluma 8218T |
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03-20-2009, 08:34 AM
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#4 |
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Registered User
Join Date: May 2008
Location: East of Barbers, AL
Posts: 116
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Re: is 10 mpg normal?
I have:
12-13 mpg, cruising speeds... no hot-rodding Last edited by Fan2zee; 03-20-2009 at 08:36 AM. Reason: Picture |
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03-23-2009, 12:01 AM
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#5 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: is 10 mpg normal?
if your C/20 was originally built with the 350/350, then it should have 4.10's out back.
Exactly what year vette is it beating off the line? |
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03-23-2009, 03:31 PM
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#6 |
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Registered User
Join Date: Sep 2008
Location: magalia,ca
Posts: 366
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Re: is 10 mpg normal?
wow thanks for the info now im sure before i never knew (well i dont think it could beat a corvette but with the parts i have on the engine it sure is quick off the line) when its not raining
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1970 2wd  3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG )
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03-23-2009, 09:33 PM
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#7 |
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Jamie Hyneman is my twin
 
Join Date: Nov 2005
Location: La Junta, Colorado
Posts: 705
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Re: is 10 mpg normal?
My 283 gets 12mpg in town with 3.73 posi 4x4. On my last road trip, I averaged 15.5 mpg.
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Justin SOLD 1967 K10 Fleetside, 283, Front and Rear Posi SOLD Color Wiring Diagrams Now in High Resolution V8 and Cab and Cab and Chassis |
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03-23-2009, 09:45 PM
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#8 |
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Senior Member
 
Join Date: Jan 2002
Location: Williston, ND
Posts: 2,999
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Re: is 10 mpg normal?
I believe you have to spin the driveshaft for this to work out right. Make sure you clearly mark the tire to get a good guess. I have gotten anywhere from 8-16 mpg with trucks we've owned. Suprisingly, a 72 sb with 402/th400/3.08 was gettin 15! On average, I would say 12-13 for a stocker tuned well.
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68 Chevy CST/10, 50th Anniversary, 327/th400, 373 posi, buckets 68 GMC Shortbox Stepside, 402/th400, Tilt, Tach, Bucket Seats, 3.08 Positraction 69 Chevy Camaro SS, 383, 4 speed, positraction 70 Chevy El Camino SS396, Triple Black, 454/th400, Tach 70 Chevy Shortbox Stepside 4x4, 350/th350, Tilt, Tach, Cab Lights, Bumper Guards, Tow Hooks 70 Chevy 3/4 Longbox, 350/auto, 70k, SURVIVOR 71 Chevy Blazer, CST, 350/auto 71 GMC Sierra K2500, 454, 4 speed, 4.10 posi, 37s 71 Custom/30, Open Road, 350/th400, tilt 72 Chevy Shortbox Fleetside, 496 Stroker/th400, Tilt, Tach, Bucket Seats, 3.42 Posi 72 GMC Sierra Grande 2500. 427/th400, tilt, a/c, tool and stowage, buckets/console, 3.54 posi |
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03-23-2009, 10:40 PM
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#9 |
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Senior Member
Join Date: Sep 2004
Location: Terrell, TX
Posts: 1,967
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Re: is 10 mpg normal?
 I used to really hate reading these threads...all the claims of big mileage in flying boxes with BB's and high numerical rear axles....now I just chuckle. Must be that new math.
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Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. |
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03-23-2009, 11:48 PM
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#10 | |
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Registered User
Join Date: Nov 2008
Location: San Jose Ca
Posts: 265
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Re: is 10 mpg normal?
Quote:
 new math is how the government keeps running
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03-24-2009, 07:03 PM
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#11 |
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Senior Member
Join Date: Sep 2004
Location: Terrell, TX
Posts: 1,967
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Re: is 10 mpg normal?
I hear ya...especially this one!
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Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. |
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03-24-2009, 12:03 AM
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#12 |
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Registered User
Join Date: Apr 2007
Location: Santa Rosa, Ca
Posts: 586
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Re: is 10 mpg normal?
Im getting about 16 - 17mpg on the highway with a 350,T5 trans and 3:90's out back.
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My build thread http://67-72chevytrucks.com/vboard/s...d.php?t=456220 Best 1/4 mile time 12.1 @ 111 w/traction issues 1969 GMC SWB 1964 chevy II Nova ht Last edited by tranz am; 03-24-2009 at 12:03 AM. |
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03-24-2009, 08:17 PM
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#13 |
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Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: is 10 mpg normal?
Honest, I put $2.00 in last week, but there is still half a tank.
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