Why did I drive that fast you may ask?
Well, at 60 MPH I was getting 24 miles per gallon according to the computer, so I wanted to see if I got half that at twice the speed.
It turned out to be 16 miles per gallon at 120.
Ah, the stupidity of youth...
D@mn! Had a '86 VW GLI up to 104. Never thought to check the mpg. Not being used to driving that fast,
I was probably concentrating on other things.
Driving around the limit with a strong tail wind, got upwards of 50mpg one trip. "Expected" mileage was 34-38 for highway.