Overhead unit - Ford Powerstroke Diesel Forum
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post #1 of 26 Old 08-14-2012, 08:10 PM Thread Starter
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Overhead unit

I've got a '01 f250 lariat and I was wondering how often y'all's mpg's change. Mine has stayed at 21.9 For about a year but I've heard other 7.3 owners say they've had a 3 mpg difference after running to the store. Any advice?

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2001 f250 lariat 2wd auto 271k
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post #2 of 26 Old 08-14-2012, 10:48 PM
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You should see some change between city and highway but whatever it says is usually wrong. It's called a lie-o-meter for a reason.

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post #3 of 26 Old 08-15-2012, 04:43 AM Thread Starter
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The mpg's don't nudge but the compass, thermometer, and the number of miles I have left still works.

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post #4 of 26 Old 08-15-2012, 04:57 AM
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The mpg display is a filtered value over time. If you push both buttons at the same time it will reset to 0. Then you will see a fluctuation in mph. It still will not be correct though.
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post #5 of 26 Old 08-15-2012, 05:03 AM Thread Starter
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Thanks, I'll reset it anyways but does anyone a solution of how to make it accurate, or will I have to live with it. I've added some lucas oil fuel additive and I wanna see what difference it's making.

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post #6 of 26 Old 08-15-2012, 06:23 AM
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Best way to see any change is at the pump. There are too many variables in how you drive, that instantaneous mpg readings can be severely misleading, even if accurate. Traffic, weather, slope, acceleration, deceleration, weight, barometric pressure... The list goes on. Pumps readings will give you a better average, and logging your pumps readings will give you long term variations.

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post #7 of 26 Old 08-15-2012, 07:22 AM
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I agree, the pump is the only way. Be consistent with topping off the tank. There's an app called Fuelly that allows easy tracking and if you use a smart phone its almost brainless.

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post #8 of 26 Old 08-16-2012, 06:59 PM Thread Starter
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I reset it after fueling up and even after going up and down a lot of hills I'm gettin 26.6 mpg's. Thanks guys for the help!

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post #9 of 26 Old 08-18-2012, 01:52 AM
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Originally Posted by bigmac13579 View Post
I reset it after fueling up and even after going up and down a lot of hills I'm gettin 26.6 mpg's. Thanks guys for the help!



26.6???? how the hell is that happening??? I must have some serious issues....
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post #10 of 26 Old 08-18-2012, 07:01 AM
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I have a couple questions about my over head also. Dont me to thread-jack but didnt want to start a new one for such a similar issue.

My miles-til-empty on the overhead is WAY off. If I am about to run out of gas it still says I can go over 100 miles... Also my temp gauge does not work, it just reads -40* at all times. Any way to fix these issues?
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