How many gallons of gas are needed if you go 700 miles in 12 hours?

Answer 1

700 miles in 12 hours means you are traveling at a speed of about 58.3 miles per hour. However while that is a reasonable speed for good fuel economy (the faster you go the more gas you use), how much gas you will need depends on the MPG performance of the car. Some cars only give you 20 miles per gallon an other modern cars will give you 60 or 70 miles per gallon.

A good diesel will do about 60 miles per gallon and thus would need 12 gallons to go 700 miles.

Next time when asking questions please try and be specific about what you want to know and supply ALL (eg the MPG performance) that is needed in the question. For instance the time it took (12 hours) is only marginally relevant in this case.