I have a Rav4 Diesel 2.2 2008 since new, and I have never reset the miles per gallon display and after 4 years it displays between 46.7 47.7 depending on the length of runs I do it has now done nerarly 39000 miles. I am more than pleased with this performance. Where ever I drive I set the Cruise Control to the current roads speed limit, and hardly ever break the speed limit.