The Prius car has a mile per gallon range of 50 to 56 miles per gallon which is pretty good and the gas tank size on the Prius is 11.3 gallons of fuel.
So if you get at least 50 miles per gallon from the Prius and you have the gas tank full at 11.3 gallons of gasoline then you could go around 550 to 565 miles on a tank of gasoline in the Prius.
When I had my Prius I was averaging about 50 miles per gallon which was okay with me as it was way more miles per gallon that I was getting with any other vehicles.
I drove that car until someone crashed into me and totaled my car while it was sitting and I was not in it.
I decided I wanted a better larger car after that even though I loved the gas mileage of the Prius.