I've only had my car for a week, so my ideas are few. I did put on 200 miles city/interstate and the tank shows just above 1/2 empty. My old Porsche 911 I just drove, only when I got it did I measure the mileage and it was about 30 mpg, good for that car. But this car is not some econobox, so I wont be sad if I dont get "Gore" mileage. I'll post when I fill the tank.