just called totoyta...it depends on stock tire size..
31" tire has a 18.8 gallon tank...
I figure if one fills up the tank and the tube that goes to the tank..you got about 19 gallons even...
trying to get an idea of my mpg...when the gas gauge needle gets to exactly 1/2 full...I will figure I have used 9-1/2 gallons of fuel and then divide that by how many miles I travelled on the trip odometer to get a estimate of MPG.
toyota told me the gas light comes on when you have about 30 miles left of driving....