Gas Mileage help!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1985K10 · 02-21-2005, 06:20 PM

Since I've got my 89 K5 Silverado I've been getting about 10MPG. I have 33-12.5-15 tires(it was getting about the same MPG with 31's), 3.42 gears, still got the auto hubs, TBI 350-700R4(rebuilt), and 131K miles on the clock.

Things I've done- New air filter,(wasnt one on there when i bought the truck), new fuel pump, filter, and tank. Since I've changed the tank, pump, and filter I havent checked the mileage yet(just done yesterday).

What can I do for better MPG, or is 10 about the best i can get?

Prerunner1982 · 02-21-2005, 06:30 PM

you didnt make mention of how you drive it.... want mpg.. feather that throttle everywhere you go. People may get made cause you are driving like an old lady. but did you ever stop and think.. maybe they know something we dont?

anyways dont get in and out of the throttle, keep your speed to where you can lightly keep your foot on the pedal and keep a constant speed..make sure tires are at proper pressure...windows up, a/c-heat is off...

1985K10 · 02-21-2005, 07:07 PM

I usually stay at one speed, on the throttle as light as possible. I dont always jump on the gas. O/D is used down hills and on flats when goin over 45MPH.

Do auto hubs kill mileage at all?

82 Silverado 4X · 02-21-2005, 07:52 PM

The auto hubs should not effect your mileage as long as they are dissengaged. When they are not engaged and you're running in 2-HI it's like running a 2WD except with the added weight.

TrainD5115 · 02-21-2005, 09:56 PM

Try running a high quality fuel injector cleaner through it. I'm getting almost 12mpg in my 79 without overdrive so I would think you could do better than that.

02-21-2005, 06:20 PM	#1
1985K10 Registered User Join Date: Oct 2003 Location: CT Posts: 315	Gas Mileage help!! Since I've got my 89 K5 Silverado I've been getting about 10MPG. I have 33-12.5-15 tires(it was getting about the same MPG with 31's), 3.42 gears, still got the auto hubs, TBI 350-700R4(rebuilt), and 131K miles on the clock. Things I've done- New air filter,(wasnt one on there when i bought the truck), new fuel pump, filter, and tank. Since I've changed the tank, pump, and filter I havent checked the mileage yet(just done yesterday). What can I do for better MPG, or is 10 about the best i can get? __________________ Anthony 07 Tahoe LT 70 Chevelle 450HP 383-TH400 77 GMC Royal Sierra~Resto in progress~

02-21-2005, 06:30 PM	#2
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,904	you didnt make mention of how you drive it.... want mpg.. feather that throttle everywhere you go. People may get made cause you are driving like an old lady. but did you ever stop and think.. maybe they know something we dont? anyways dont get in and out of the throttle, keep your speed to where you can lightly keep your foot on the pedal and keep a constant speed..make sure tires are at proper pressure...windows up, a/c-heat is off... __________________ Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call Last edited by Prerunner1982; 02-21-2005 at 06:36 PM.

02-21-2005, 07:07 PM	#3
1985K10 Registered User Join Date: Oct 2003 Location: CT Posts: 315	I usually stay at one speed, on the throttle as light as possible. I dont always jump on the gas. O/D is used down hills and on flats when goin over 45MPH. Do auto hubs kill mileage at all? __________________ Anthony 07 Tahoe LT 70 Chevelle 450HP 383-TH400 77 GMC Royal Sierra~Resto in progress~ Last edited by 1985K10; 02-21-2005 at 07:11 PM.

02-21-2005, 07:52 PM	#4
82 Silverado 4X Genuine Chevrolet Join Date: Feb 2003 Location: South West Pennsylvania. Posts: 582	The auto hubs should not effect your mileage as long as they are dissengaged. When they are not engaged and you're running in 2-HI it's like running a 2WD except with the added weight. __________________ George 82 Silverado LWB 4x4 350 SM465 NP208 77 Chevrolet Blazer Chalet 400 TH350 NP203

02-21-2005, 09:56 PM	#5
TrainD5115 North Coast, baby! Join Date: Jun 2004 Location: Toledo, OH Posts: 437	Try running a high quality fuel injector cleaner through it. I'm getting almost 12mpg in my 79 without overdrive so I would think you could do better than that. __________________ Brad 79 Scottsdale C20 350/350 3.73's Still running full CA smog gear!



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