Do you mean that your first 5 miles has, for example, a trip average of 32 mpg, and then the trip average gets better as you go?
I guess the best trip average you could hope for is slightly less than your best 55mph instantaneous MPG if you don't pulse and glide and are driving on a flat plane.
I like the trip MPG function as it shows how bad your mileage is on short trips, and the cost per trip function. Costs me a dime to get out of my driveway!
Ian
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