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8.1 fuel mileage help

tractorsx

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tractorsx Enthusiast

tractorsx

Posted
Posted

I'm new to this board and am not getting search function

to work. I sure that this topic has been gone over many

times, But, what the heck.

I just bought a 2005 GMC 2500HD with 8.1, with allison tranny,

I knew mpg would be bad, I acepted that from the getgo, but is there

things that I can do to help. Mostly thinking about cold air intake and

daul exhaust. Pickup is mostly used by wive to get to work, less than

3 miles one way. Thanks

moo snutz Enthusiast

moo snutz

Posted
Posted

Welcome :chevy:

I only have 1200 miles on my truck - I commute into town at +/- 60 mph for a roundtrip of 35 to 50+ miles 50% thru traffic depending on where I'm picking up my badazz kids from day school/care. Anyway, I'm averaging a fill up everyday 6 or 7 days & getting mid 11s. Not sure if the Allison combo would get the same.

 

I live at 7000 feet so the first thing I plan to do is get a Volant intake maybe a Magnaflow exhaust. I think the best thing to help MPGs is to let up a little on the good foot. :seeya:

 

moo

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

Skip the duals, get a GOOD intake system and a Wester's custom tune and drive it like THE BIGPUNN suggests.

 

I live at 7,200 ft and if I drive it like an old man I can get 14.1 on the highway at 55 mph. As soon as funds become available the intake and the Westers is going in.

 

DEWFPO

GMSVCMGR99801 Enthusiast

GMSVCMGR99801

Posted
Posted

I drive 6mi each way to work and do almost no highway driving. I consistently get 9.5 to 10.5 and I do not drive it easy. Only performance mod is dual flowmasters (wich sound ridiculously cool) and I will be sending PCM to Wester's soon. I have 3.73 gears and get only 6.5 when towing my 21' Bayliner (5000lb ish). :chevy:

nsmilligan Enthusiast

nsmilligan

Posted
Posted

I added a Westers 87/89 tune to my 8.1/Allison 04 3500SRW, and an Airaid intake, mileage jumped over 70 miles/tank. More preformance and a solid 12-13 MPG rual/town driving. Haven't had it on a trip to see how it will do on the highway.

 

Bill

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