Well... I just got 16.5 mpg with my car! Best so far and I now know it can do better than that if I try. Mostly highway but still plenty of playing around. I did recently take out the sprint booster because it made the car not easy to drive/control, and opened up the intake a little, I have been rolling on the throttle slower to keep wheel spin down to around 40 feet or so.

The more I drive the car the better mpg it is gets!!!