Why does the instrument panel show two mileage averages? The first one (and higher avg) is displayed next to the current mileage bar. Then the next display is another average, a little lower. The higher one reads 35.7 and the lower one reads 33.8. I only have about 210 miles on it so far. My car is brand new and still on it's first tank of gas. I just got it on Wed, 8/1/12. And I also haven't figured out how to fine the Trip Odomoter. Thanks.