I just finished a trip this last weekend and decided to use the car's trip computer in the Nav unit to calculate it, so take that for whatever it's worth. It was 197 miles in distance. Trip computer said avg speed was 72.6mph (a lot was running 90+mph) and it got 25.3mpg.
That was burning 93 oct fuel with a Dinan stage II tune and vehicle just turned over 7K miles.