"Miles to Empty" readout goes crazy - Ford Mustang Forum
 
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post #1 of 2 (permalink) Old 07-21-2013 Thread Starter
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Joined: Aug 2011
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"Miles to Empty" readout goes crazy

In an attempt to get my car running yesterday after a failed SCT tune upload, I disconnected the battery terminal for a few minutes. When I finally got the car running, the "miles to empty" readout said 345, which was more than 100 miles further than it's read previously--plus the tank was only half full. I filled up shortly afterwards and the readout shot up to 385, something I would expect to see on the wife's Accord.

Usually at fill up the readout will be in the 225 range. In the 7,000 mile life of the car, I've only averaged 15 mpg, so there's no way the number is anywhere near accurate.

Could disconnecting the battery and flashing the ECU make the readout go nuts? I drove the car 50 miles today and the readout is still insanely optimistic. Everything else seems normal.


2013 Deep Impact Blue GT Premium, MT82, Comfort,
Electronics, 3.73 gears, Ford Racing Strut Brace,
Boss 302S 19" wheels,
255-40-19 Michelin Pilot Super Sports,
Bama 91 Octane Race Tune
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post #2 of 2 (permalink) Old 07-21-2013
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Sounds like what you see after a full reset.

If you've ever noticed, it resets to a mileage number after fill-up based on the average mileage the computer had logged, and not a logging mileage you have any control over to reset except without unplugging the battery and loading a tune. So if your last couple hundred miles were high mileage highway miles, then a fill-up will display a high estimate for Miles-to-Empty.

Don't worry about for now, just drive a tank of gas through normally, and that number will return to normal.


2015 Mustang GT PP 401A Black | Roush Supercharger
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