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Nope. I have real time and overall mpg both displayed, I understand the difference. I reset my trip mileage after every single fill up and it has never once been accompanied by a reset of my overall average. My overall was at 18.1 and 18.2 for years. About 2 months ago, my real time display showed --.- out of the blue and my overall average was showing 99.9. It stayed like this for about 2 weeks. Then one day I turned on the car and my real time mpg was working again and my overall mpg started working it's way down from 99.9. Its now at 19.2 and I expect it to continue downward at a slower pace...I do a lot of highway miles. As stated in my previous post, I am on the original battery and there were no other issues with the car during that 2 week period. I never found out why the mpg displays stopped working for those 2 weeks.
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