'02 7.3L getting 40 mpg!!!! WTF!!! - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 03-18-2007, 07:29 PM Thread Starter
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'02 7.3L getting 40 mpg!!!! WTF!!!

Just recently purchased a '02 F-250 CC 7.3L that had a bad overhead message center (fading in and out). I bought a new message center and installed it myself. The compass and temp. is working correctly but the average mpg is reading crazy numbers.
Just did a little road trip and it is showing anywhere from 30 to 44 mpg! And when I checked the mpg with actual mileage and gallons with a calculator I'm getting 21.2 mpg.

I'm aware how to calibrate the compass, but should I somehow calibrate the average fuel mileage? I didn't see anything in the owners manual how or even if I could do the later.

Thanks
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post #2 of 21 Old 03-18-2007, 07:47 PM
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ive never heard of calibrating the "lie o meter"

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post #3 of 21 Old 03-18-2007, 07:50 PM
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post #4 of 21 Old 03-18-2007, 10:18 PM
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It is best to just do the calculations by hand. As Stump said its called a "li-o-meter" for a reason. It should be real close if its stock, if you have a tuner or chip then it will be way off.

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post #5 of 21 Old 03-18-2007, 10:42 PM
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It will also take some time to get the numbers to average, to bring it down to a more believable incorrect reading hahaha.

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post #6 of 21 Old 03-19-2007, 04:41 AM
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check to make sure it is showing the english reading instead of metric. hope it helps.
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post #7 of 21 Old 03-19-2007, 03:27 PM
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i believe if look in your manual but you press e/m once then mode until AVG is lite on the message center and re calibrates it closer the truth

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post #8 of 21 Old 03-19-2007, 06:02 PM Thread Starter
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Thanks fellows. I failed to mention that I did have the Superchips installed when I installed the new message center.
I was on my way to the Ford dealership today to have them check the truck computer to make sure everything was as suppose to be. I decided to take the Superchip out of the equation just to be sure.
Sure enough, the message center started acting alot better. Must be something to do whit the programmer.

I know that the "lie-O-meter" isn't suppose to be dead on, but at least it gives me an idea how things are going while I'm on the trip. I do always use a calculator when I fuel up.

Thanks for everyone's input
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post #9 of 21 Old 03-19-2007, 06:13 PM
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Reset it

Every time you fill up and it will be pretty accurate.
post #10 of 21 Old 03-23-2007, 11:42 AM
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My "lie o meter" shows consistantly 22-23 mpg vs. my calculation that comes up with 14-15mpg.

14-15 seems a bit low though as it is mostly freeway driving. Could the fact that I have larger tires be throwing the odometer off as the tires have a larger circumference? These are non-towing miles too.

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