how to change mpg calc to not reset?

If memory serves, the distance resets but the actual MPG calculation does not reset by itself.

 

<div class='quotetop'>QUOTE(brick @ Feb 21 2007, 02:27 PM) [snapback]394108[/snapback]</div>

This depends on the year. My 2005 resets both automatically when refilling. I hear that the 2004's also do that, but that 2006 and 2007 reset only the miles -- not the MPG accumulation! You'd have to manually reset each time you refill to get the two things displayed next to each other to actually correspond to each other.

Go figure.

I have not heard of a way to prevent the reset on refill, whichever way it works.

 

<div class='quotetop'>QUOTE(ruggb @ Feb 21 2007, 10:50 AM) [snapback]394048[/snapback]</div>

YES . . . you could always try adding just two gallons, then turn the car on and off, and repeat until full.
Of course, this would be a pain in the butt . . . not to mention people at the gas station would think you are nuts.
You would also have to worry about fire safety from static build-up and discharge due to your repeated entries and exits from the car.

An electronic fix? None I've heard of.