How many times will you have to fill up my tank going 369 miles with a 13 miles per gallon tank?

As the cost of gas goes up it becomes more and more important to use it more efficiently and ... It is relatively easy to calculate how many miles per gallon you are getting. ... But if yours doesn't calculate the miles per gallon, you can easily do it ... Simply fill up your gas tank (make sure it is full i.e. the pump shuts off) and write ...