Over optomistic fuel mileage - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 10-25-2009, 07:55 PM Thread Starter
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Over optomistic fuel mileage

Computer is always 1/2 mile per gallon or more off from mileage figured the old fashioned way. Is there any way to adjust it to be more realistic?
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post #2 of 18 Old 10-25-2009, 09:13 PM
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short answer... no

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post #3 of 18 Old 10-26-2009, 09:51 AM Thread Starter
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Was afraid that was the answer. Thanks
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post #4 of 18 Old 10-26-2009, 02:16 PM
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Only 0.5 MPG high? Mine is usually 1.0 MPG high.

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post #5 of 18 Old 10-26-2009, 05:59 PM
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mine has been off by at least 1mpg all the time

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post #6 of 18 Old 11-07-2009, 07:43 AM
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mine was within 2/10 sometimes high, sometimes low. Spartan came along, now it is at least 2 mpg off. that being said, hand calculating it, it averages about 3 mpg better.
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post #7 of 18 Old 11-07-2009, 03:30 PM
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I have a 7.3 but mine NEVER changes from 14.5...I think I need to order a new one...
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post #8 of 18 Old 11-07-2009, 03:33 PM
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dont forget when your running bigger tires, your speedo will be off as your mileage will too.

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post #9 of 18 Old 11-07-2009, 03:37 PM
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yeah I did hand calculations and it seems insane but before I left on deployment we rode 800 miles and filled up twice, and it came out to 18.something mpg...I got pretty excited, hopefully my new tuner, exhaust and intake will help with mileage....ordered all 3 new, I wanted new exhaust, the intake was sh......and the tuner was not there.

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post #10 of 18 Old 01-23-2010, 01:04 AM
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I guess I have to ask do you reset it after each tank full, this could be the cause of the .5 error.
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