You cannot convert measurements to weights or weights to measurements
It depends upon the vehicle. A Prius can get you upwards of 40 mpg, while a Chevy Tahoe may only get you 9 mpg.
The amount of miles you can drive on a gallon of gas depends on the vehicle you are driving and how efficient it is. There is no direct relationship between gallons and miles.
20 miles to the gallon 20 miles to the gallon
15 miles to the gallon 15 miles to the gallon
it can get 8 miles to the gallon
18.5 miles a gallon
16.5 miles per gallon
52.27 miles per gallon
About 21.4 miles per gallon. (300/14 = 21.4)
Between 13 miles per gallon and 16 miles per gallon.
it will do around 24 miles to the gallon
5.8 miles per gallon
9-13 miles per gallon
about 10 miles per gallon