I am doing a little test right now. I am not overly concerned about gas mileage as I know this is a performance car. After three consecutive fill ups in which I averaged 22 miles per gallon I wondered how much mileage I could get from a tank if I drove like a little old man. I did this for two reasons:
1. because I am a little old man
2. Out of pure curiosity.
So I never exceeded 55 mph, never passed anyone and always shifted before 3K. This is rural route driving which is close to highway driving. I won't know the results until Saturday though.
However I can say this . It has been a very painful experience, driving this car , that slow. It should only be performed by highly trained drivers.