I would like to know how you manage 15-16mpg on the highway at those speeds. I have a R/C and driving at 65mph I get about 13.5-14 max. The faster i go, the more it drops. At 75mph I am at 12.5 mpg. And this is with a tune in it as well. Now, granted, on the back roads I drive with my foot in it a lot, and I would expect low mileage then, but on the highway I would expect the 15mpgs others are getting.