Chevy 8.1 Vortec fuel mileage??
#1
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Chevy 8.1 Vortec fuel mileage??
What kind of fuel mileage should I expect on an '01 8.1 Vortec 4X4 dually??? I've heard 5mpg towing 10,000 lbs and 8 with no load around town...
#2
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I have a 2001 GMC 2500 HD 4X4 Xcab with the 8.1 and Allison tranny..I get about 9MPG around town, much less when towing about 7500 lbs. I haven't calculated the mileage when towing because I don't think I want to know..
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I own an 01 crew cab dually with the 8.1. I've kept track of every tank of gas since I got it. It's a consistant 9.0-10.0 mpg truck. City 9.0 freeway 10.0. It gets even worse when you start towing. I tow a 35 fountain and she starts drink as soon as I hitch her up. I don't tow far so my milage is usually 8-9. I can only guess what it gets taking it for a long haul.
#5
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SR,
thanks for the info. What is your opinion of the truck overall? How is the ride(I'm coming from Jeep Grand Cherokee)? I assume this does not have the Allison and do you know what gears are in the rear? Thanks.
Sean
thanks for the info. What is your opinion of the truck overall? How is the ride(I'm coming from Jeep Grand Cherokee)? I assume this does not have the Allison and do you know what gears are in the rear? Thanks.
Sean
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Great truck I wouldn't trade it for anything else. The ride is pretty good. Much better than the previous style dually. I've got the allison with the 4.10 gears and it's 4x4 also. I saw the 03's have the dvd player in them. that's the only reason i would want to trade it in. I have 32,000 miles on it in the last 24 months. No problems. A friend of mine has the same truck but has over 60,000 miles on his in the same time period and he trailers a boat all over the us and he's had no problems either.
#8
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I have the 8.1 in the 2500 Avalanche. I have seen as high as 14 at pure highway; not towing. I also have the 4spd M32 Auto with 4.10 gears. After the mods I have done, I think I get around 10 daily driving, and should still be above 7 towing. I hope!
#9
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I have a 2001 2500HD CC with 8.1, allison trans, and 3.73 gears. I get between 9.5 and 11.5 mpg. Only put about a 1000 miles on it since I bought it about 6 weeks ago and only towed with it once for about 50 miles. About 75% of the miles are at highway speeds for my mpg figures. This is about about 20% better than '93 454 TBI dually got with 4.10 gears.
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Sorry for all of the questions...but, what is the difference between the Allison and a regular automatic transmission...is the Allison built better for towing?