500 mile trip, what gas milage to expect - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bufmatmuslepants · 06-13-2007, 01:24 PM

i have to figure out if i can afford the gas to drive my truck from school here in WV to home in CT. its about 500 miles, and if im gettin 10mpg thats 50 gallons x $3 a gallon = $150. its a stock 79 K10 turbo 350 350 4 barrel, NP203 case, has the stock cat and muffler on it and the pipe out of the muffler is about 2 inches diameter..maybe less. stock intake and 33x12.5 tires. anybody have any guesses on what gas milage ill get on the highway with this thing?

benoit454 · 06-13-2007, 01:35 PM

Man that's a full time 4x4 case in that thing I'm surprised with that, the th350 and the 33's you get 10 miles to the gallon.

Our 86 was a 208 part time case, we ran in 2wd all the time, it had 33's and 3.08's with a 700r4 and only got 10 mpg around town. The highway seemed better though.

I say if you are lucky maybe 15-20 on the highway. More then likely 10-15 mpg.

kevinr1970 · 06-13-2007, 03:08 PM

I got ~12.5-13mpg with about 90% freeway (70mph) last time I checked.
1986 1/2 ton 4x4 in 2wd, 350, 700r4, 3.73 gears.
That was with a carb that didn't want to accellerate off idle very well so you ended up juicing it pretty good to get it rolling. I think that might pick up a smidge now that the carb is behaving better.
But I think that 14mpg might be the best I could hope for.

06-13-2007, 01:24 PM	#1
bufmatmuslepants Junior Member Join Date: May 2007 Location: Hampstead, NC Posts: 313	500 mile trip, what gas milage to expect i have to figure out if i can afford the gas to drive my truck from school here in WV to home in CT. its about 500 miles, and if im gettin 10mpg thats 50 gallons x $3 a gallon = $150. its a stock 79 K10 turbo 350 350 4 barrel, NP203 case, has the stock cat and muffler on it and the pipe out of the muffler is about 2 inches diameter..maybe less. stock intake and 33x12.5 tires. anybody have any guesses on what gas milage ill get on the highway with this thing? __________________ 1979 K10 reg cab short bed 33x12.50s - GONE 1988 4x4 reg cab long bed 337k miles - GONE 1995 Z71 GU6 G80 F44 ext cab short bed 149k 305/70/16s - GONE 1995 NZZ GT4 2dr Tahoe 3" lift 14 bolt sf 155k 305/70/16s - GONE 1994 Z28 M6 1995 Z71 GT4 G80 ext cab short bed 215k GONE 1997 GT4 G80 Yukon 4 door leather, sunroof 168k miles GONE 2003 Avalanche Z71 GT4 G80 165k miles

06-13-2007, 01:35 PM	#2
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: 500 mile trip, what gas milage to expect Man that's a full time 4x4 case in that thing I'm surprised with that, the th350 and the 33's you get 10 miles to the gallon. Our 86 was a 208 part time case, we ran in 2wd all the time, it had 33's and 3.08's with a 700r4 and only got 10 mpg around town. The highway seemed better though. I say if you are lucky maybe 15-20 on the highway. More then likely 10-15 mpg. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

06-13-2007, 03:08 PM	#3
kevinr1970 Senior Member Join Date: Aug 2004 Location: Everett, WA Posts: 2,316	Re: 500 mile trip, what gas milage to expect I got ~12.5-13mpg with about 90% freeway (70mph) last time I checked. 1986 1/2 ton 4x4 in 2wd, 350, 700r4, 3.73 gears. That was with a carb that didn't want to accellerate off idle very well so you ended up juicing it pretty good to get it rolling. I think that might pick up a smidge now that the carb is behaving better. But I think that 14mpg might be the best I could hope for. __________________ 2009 Honda Fit CfC (bsf 44.9 mpg) 2000 Tahoe Limited 1991 GMC CrewCab Dually 2wd, will end up swb, not dually and replace CCswb below 1991 GMC CrewCab Dually 4x4, just going to fix things up for now 1982/1989 K5/GMC Jimmy 2wd 1987 GMC 1/2 ton swb 2wd Crew (sold)



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