what a fcuking dumb question! you and your friend should look at 'socialising' in the future.
That was what the old 300SL Mer gullwing was each car is different. It was the first and possibly only car even with proper performace manual sold with the car graphing efficiency. The 300SL was a racer of sorts so had a very earodynamic body plus was geared for suck a CLio and most cars are best almost idling in 5th gear.56 mph is optimum speed, fuel usage goes up alot after that.