My GX does the same thing, 1.5 to 2.0 mpg optimistic. I would also like to hear if and when someone discovers a way to calibrate it. I can also reset the average speed while driving at a steady speed on cruise control, and the computer reads about 3mph slower. If these two calculations are related to the same input data, the problem gets more confusing as if the distance the computer thinks I'm covering versus fuel consumed is less, the mpg should be pessimistic, no?
Nitpicking, to be sure, but for $50k+ I expected more.
