Check the fuel comsumption as you would normally do, fill tank, run a few laps, fill tank, calculate. Only problem here is traffic. 1 pokey slow, and results are out the door. My suggestion is to run the back of Pine Flat. Minimal traffic, hardly ever see a cop. Or run out Burrough Valley/Maxon, R. on Watts, R. on Pittman Hill, R. on Sample, etc.. Back to Burrough Valley. Rinse, repeat. That should be about a 20+ mile course. Now, Who wants to volunteer to do the driving?!?!