If all my driving was in trips under 50 miles (round trip) would I ever need to use any gas at all?

Other answer:

Michael Anthony:

If you are lucky you drive there,stop. Get back in then drive home. With a economical car you would get about 40 Miles Per Gallon of gas so you would use about 1.25 Gallons every time you did the trip

Andy C

Is this a serious question?
Abandon all ships:
It's usually 2 gallons for 50miles