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04-07-2007, 10:44 PM
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#1 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,087
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'71 K-20 Gas Mileage
I'm looking at a '71 K-20 4 X 4 with a 350, 4-Barrel Q-J, and a granny gear 4-Speed trans. Not sure of the rear gears, but they should be typical stock.
What would you all say the typical gas mileage would be on a truck like this? |
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04-07-2007, 10:57 PM
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#2 |
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Dave's not here, man
Join Date: Jun 2004
Location: Winder, Georgia
Posts: 2,000
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Re: '71 K-20 Gas Mileage
I would guess 8-10 mpg. I guess it depends on how well it's tuned and how heavy the driver's foot is.
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- 2014 VW Jetta - 2015 VW Jetta - 1966 Ford F-250 |
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04-07-2007, 11:10 PM
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#3 |
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Well, Whoop-dee-do!
 
Join Date: Mar 2003
Location: Easton, Mo. pop.- me & scarcely a few others
Posts: 2,302
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Re: '71 K-20 Gas Mileage
Yep, 8-10 if all's good. Tired, out of tune or low on power you can expect much less. My '72 with the 500 Cad doesn't really use any more gas than it did with the original 350. The best I ever got out of one was with a SB 400- it would get 11-12.
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'68 GMC shortbox 4x4 350/SM465/T221- bought it in '83 SOLD  '72 K20 500 Cad/TH400/NP205 SOLD '92 Chevy 2500 6.5 mech TD 4L80E crusty daily driver '72 Monte Carlo... sweet low mile toy '11 Dodge Challenger IE 392 6spd... midlife car 
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04-08-2007, 12:13 AM
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#4 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,087
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Re: '71 K-20 Gas Mileage
Appreciate the info y'all.
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04-08-2007, 12:22 AM
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#5 |
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Registered User
Join Date: Feb 2007
Location: Star Valley, WY
Posts: 2,038
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Re: '71 K-20 Gas Mileage
i'll brag a little. my EFI'd 496 got 13.2 on my last road trip. around town I get 8-10 though. but I culdn't be happier, except if it cost less.
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Steve 1971 GMC Longbox. Full Roller Stroker 489 w/ FiTech EFI, Chris Straub Cam/NV4500/205/D60/14B w. Grizzly Locker and 4.11's. 2" Lift on 33's |
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04-08-2007, 12:31 AM
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#6 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: '71 K-20 Gas Mileage
10 - 12 seems to be the average on these trucks... but, the average truck isn't a 4X4 either.
I'd say 8 - 10. http://67-72chevytrucks.com/vboard/s...d.php?t=172346 |
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04-08-2007, 01:28 AM
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#7 |
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Registered User
Join Date: Mar 2007
Location: Oregon
Posts: 109
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Re: '71 K-20 Gas Mileage
I agree its about 8-10 mpg on my K20 as well. I put on a heavier throttle return spring and changed my driving habits and it has gotten better. I try to have it into 4th gear by 20mph.
Last edited by Farmstore34; 04-08-2007 at 01:28 AM. |
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04-08-2007, 04:14 AM
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#8 |
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Registered User
Join Date: Aug 2006
Location: Bakersfield,CA
Posts: 7,893
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Re: '71 K-20 Gas Mileage
i get about 8 city and 11 highway (2wd)
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-steven Alte Seele S.S. "Allison" '72 C/10 LWB 350SB/TH350 - DD PITBULL IS NOT A CRIME |
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04-08-2007, 10:45 AM
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#9 |
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Special Order
  
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,851
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Re: '71 K-20 Gas Mileage
I figure around 10mpg,don`t really want to know.It`s way better on two-lane hiways where I`m good at 50-55 mph.I get on the interstate and roll 65-70 and listen to it guzzle.I like to just "bop" around in my 4spd truck and enjoy it`s un-modern old-real truck feel.Driving country roads at 40-45 mph I`d say I could get 12 mph.I have 4.10s and 35" tires,that`s my o/d.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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