mileage results vary widely according to driver , road , and weather conditions

for example , a test of a 1500 Hemi......

https://www.youtube.com/watch?time_continue=13&v=I5d_Bp3gD-o

another example , Ive got an old 97 12 valve Dodge , 17 mpg is about all you will see under mixed conditions and warm weather , best it ever did was 23 @ 65 mph on a steady trip , light wind and flat terrain


more speed would drop it down pretty fast