Question: determine which car gets the better gas mileage

Short Car A gets better millage

Car A
Distance = 300
Gallons = 8

Miles per gallon = miles / gallons
Miles per gallon = 300 / 8
Miles per gallon = 37.5 miles per gallon

Car B
Distance = 320 miles
gallons = 10

Miles per gallon = miles / gallons
Miles per gallon = 320 / 10
Miles per gallon = 32 miles / gallon

Car A = 37.5 mpg (all other factors equal) gives better millage. Bigger in this case is much better.