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Gas mileage Chevy/GMC trucks

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Old 03-12-2004, 12:33 PM
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Default Gas mileage Chevy/GMC trucks

I need to buy a different truck this year (used) and I was wondering what you guys are seeing for real world gas mileage numbers. I am not interested in a diesel at this time. I am talking about the 6.0 and the 8.1 with the Allison trans. The trucks will be either extended cab or crew cab 4 X 4 models. Most likely 3.73 gears.

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Old 03-12-2004, 01:33 PM
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6.0 3/4 suburban

10 city 13 hwy

towing 8500# 9
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Old 03-12-2004, 02:46 PM
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I just bount (pick it up tomorrow) a 04 Crew Cab 4x4 with the 6.0 and 4:10 gear. I will let you know mileage numbers next week. Everyone I talked to said the 8.1 is so hard on gas it just is not worth it. It is also not very common. I think it depends on if the truck will be used for every day driving of just towing.
I was told that I can expect 15 and 17 when not towing.
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Old 03-12-2004, 02:47 PM
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I just bought an '04 Avalanche 2500 with 8.1 Vortech/4L85E tranny/4.10 rear diff and average 11 mpg with half interstate and half suburb driving. With a 37 gallon tank I have almost a 400 mile range per tank and $60 each fill up.
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Old 03-12-2004, 03:36 PM
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I have an 02' chevy 2500HD with the 8.1 and allison trans... I get about 11 MPG city and about 13 MPG highway not towing anything... less of course with a load... not all that great to say the least...
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Old 03-12-2004, 04:02 PM
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Dad had an 01 2500 4X4 ex cab 6.0L with 4.10 gears and pretty much got 11mpg all the time city or highway.

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Old 03-12-2004, 04:19 PM
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so far have averaged 12 mpg for 10,000 miles on my crew cab 4x4 with 3.73's. Sucks more fuel than my 5.7 ever did.
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Old 03-12-2004, 05:11 PM
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Default I just fill it up

I need my Suburban so the mileage doesnt matter! Besides I can haul 9 a$$es anywhere in it
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Old 03-12-2004, 08:22 PM
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My cousin has an 01 2500 4x4 with a 6.0. He says he gets 13 on the highway, and isn't real happy about it either.
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Old 03-12-2004, 10:44 PM
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I HAVE AN 03 SUBURBAN 8.1 373 GEAR . FROM MARYLAND TO KEY WEST WITH 9000 OR SO LBS. BOAT GOT 9MPG UNLOADED 13MPG . I WOULD GO WITH THE 8.1 -373 GEAR OVER THE 6.0. 6.0 WITH 373 IS UNDER POWERED , 6.0 WITH 4.10 SAME MPG AS 8.1 373 BUT NO BIG BLOCK TORQUE.
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