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strange fuel mileage issue

strange fuel mileage issue

Postby barroncm [OP] » Feb 27 2021, 5:37am

My 04 2500hd seems to have this weird fuel mileage issue, I drive 45 min one way to work each day. I use 1\4 tank going to work and 1\8 coming home. I drive the same way to and from work.
I am totally lost as to why.
Any ideas?
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Re: strange fuel mileage issue

Postby roorancher » Feb 27 2021, 5:42am

Arw you going by the gauge, or starting with a full tank when you leave the house, then filling up when you get to work, then filling up again when you get home to check the gauge for accuracy?
Could be the sender in the tank or the gauge.
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Re: strange fuel mileage issue

Postby barroncm [OP] » Feb 27 2021, 5:57am

Good question, I am going by the gauge (for now only had the truck a short time).
I understand the gauge is not always accurate. The only diffrence is ambient air temp.
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Re: strange fuel mileage issue

Postby SierraHarley » Feb 27 2021, 7:47am

Are you going more uphill to work? Is there more traffic on one of the trips?
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Re: strange fuel mileage issue

Postby davester3500 » Feb 27 2021, 8:33am

...there's also prevailing winds... I can tell in my '04 Sierra when I'm driving with the wind or against it.
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Re: strange fuel mileage issue

Postby barroncm [OP] » Feb 27 2021, 4:04pm

To answer both questions, if anything its more uphill on the way home(where I use less gas) than on the way to work.
The 45min drive is all highway driving so no real traffic issues that could affect it.
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Re: strange fuel mileage issue

Postby GBSierraSLE » Feb 27 2021, 10:01pm

Every GM vehicle I've ever owned (going back to the '60s), the gas gauge moves very slowly from Full down to 3/4 then moves more quickly from 3/4 to 1/4 and fastest from 1/4 to E.
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Re: strange fuel mileage issue

Postby barroncm [OP] » Feb 28 2021, 2:47am

I would claim this as the reason, except, I am guaging by the same spot all the time. 1\2 tank when I leave for work then end at 1\4 at work back to 1\2 leaving work, 3\8 when I get home.
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Re: strange fuel mileage issue

Postby i82much » Feb 28 2021, 3:57am

demonic possession. very common on the lq4 trucks. there is a tsb on this.
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Re: strange fuel mileage issue

Postby Walkers » Feb 28 2021, 4:03pm

i82much wrote:demonic possession. very common on the lq4 trucks. there is a tsb on this.



I think I had a truck with that before!
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