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Old 03-20-2005, 05:07 PM   #51
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Location: Cincy, OH
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I'm guessing on my 71 bored 30 over, cam'd, other preformance acc.'s old 3 speed, and a stock 3.07 gear ratio I get about 12 in town
'71 GMC 350 bored, cam'd, straight pipes

redz 1970 K5
"Time has stopped for our classic trucks, and as such maintain nostalgia and simplicity of the vehicles and of an era passed."
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Old 03-20-2005, 11:55 PM   #52
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Location: Modesto, CA
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took it for its first road trip since the drivetrain restoration this weekend and got 12mpg through the 4 days. fuel injected, 350/350 with a 3.08 rear end
Current owner of 2016 2500 Silverado Midnight Edition.

Former owner of:
69 1/2 ton, change from long/fleet to short/fleet, shaved door handles, shaved tailgate, 4/6 drop, power windows, 700r4
72 blazer, 350 with Holley Commander 950 DFI, crane energizer cam, 350 tranny, dual sanderson blockhuggers/magnaflow exhaust
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Old 03-21-2005, 07:30 AM   #53
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My old 402/th400/qjet/crane hmv-272 cam/4.1 rear/9.50x16.5 bias would get 10.5mpg around home and 13.5mpg highway@55mph, 3200lb slidein camper it would get 8.5-9.5mpg highway no head wind.
Since the rebuild same cam/engine combo but a new edelbrock 1411 carb and HEI, best sofar was 11mpg, average around home 9.5mpg, towing a 5500lb travel trailer around home 6.75mpg. Thinking of going back to the QJET.
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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Old 03-21-2005, 10:44 AM   #54
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Probbaly no better than 5mpg.
FocuzTech Performance

Evergreen Protective Coatings
Gatorhyde...the best kept secret in spray in bed lining & protection
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Old 03-21-2005, 11:34 AM   #55
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About 12 with a crate 350 th350 and 3:73 gears..

MEMBER #6377

72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free.

Project "7DEUCE"

check out my build

Tim Powell..R.I.P EastSideLowlife..... R.I.P..
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Old 03-21-2005, 03:35 PM   #56
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Location: Northern Black Hills, SD
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'69 K20, 350/265 Hi-Torque + Q-jet + stock ramshorns w/ dual exhaust + 33" tires + SM465 4-speed + 4:55's = 11mpg

Hence, the 50 gallon auxillary tank in the bed . . .
1969 Chevy K20 Fleetside
1979 Chevy K10 "ROBAHOR"
(Rusted Out Beyond All Hope Of Repair)

Last edited by wyoman64; 03-21-2005 at 03:39 PM.
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Old 03-21-2005, 06:01 PM   #57
Beer Power!!!!!!!!!!
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Join Date: Nov 2003
Location: Nacogdoches, TX
Posts: 280
On our recent trip to Boykin Springs Park, about 64 miles each way, the truck got there on a quarter tank and we returned on another quarter. 128 miles on half a tank of gas, or I guess about 7.5 gallons of gas. 128 divided by 7.5 equals around 17.06 miles per gallon. The truck is totally stock from factory, 307 V-8, 2bbl carb, 3 speed column shift and no air. I was running 4 brand new tires and just had an alignment done as well.
Rather be fishin'
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