At what speed does EPA test highway MPG?
At what speed does EPA test highway MPG? 80 mph Vehicles are tested at a top speed of 80 mph in order to calculate the highway mpg estimates. EPA utilizes five test cycles to represent real-world driving conditions. How to calculate miles per gallon for 30 Gals? That means you can go about 300 miles before you have to refill. 30 gal x 10 mpg = 300 miles. Remember MPG= Miles / Gallons so mpg=M/G this time we want Miles= something so we can just multiply both sides by gallons to get rid of the G on the bottom. So...