How do you go from miles per gallon to gallons per hour?

Question

If you have the answer that would be great.

Answer 1

if you go sixty miles per hour and your car gets 20 miles per gallon then gallons per hour =60mph/20mpg

or 3 gallons per hour

Answer 2

You need to know the mpg number for your given speed.  If you get 25 mpg and you drive 75 mph, you're using 3 gallons per hour.  If you drive 50 mph, you're using 2 gallons per hour.  But a car that gets 25 mpg at 50 won't get 25 mpg at 75, it'd be closer to 20.

Basically, it's mph/mpg.  50 mph/20 mpg means you're using 2.5 gallons per hour.  70 mph/17 mpg gives 4.1 gallons/hour...