I drive a 2001 MDX touring and I've got 3 questions. 1. Does the figure displayed as the average mpg on the trip screen truely reflect how efficiently the vehicle is using gas? 2. What is the likelyhood of this figure being wrong? 3. If I'm getting a reading of about 10mpg within the city, what should I do, bearing in mind that the EPA rating for the vehicle is 17/23?