What Is MPG?
What is MPG, you ask. Well MPG stands for Miles Per Gallon, which is the number of miles you can drive per gallon of gasoline. Gas mileage is typically expressed in two numbers, highway and city. You might look at these numbers and think where people came up with this, but the EPA has special laboratories where they intensely test vehicles to come up with a car's MPG.
The rigorous process?