Re: mph reset
I had the same experience and thought something was wrong. The owners manual say, "Then, the history information will be erased, and the averaging will continue from the last fuel average reading before the reset." Not sure exactly what that means, but it does display the last number before the reset. Maybe it begins to average over a smaller sample, but it certainly isn't clear. My Olds Aurora would stay blank for a short time until it had enough of a sample to display a number, which is the way I would prefer it to work.