How much fuel should I order?

To calculate the amount of fuel you need to fill your tank based on your tank size and the amount of fuel left in it, please follow these steps.

Determine your tank's total capacity

This information can often be found in your owner's manual or by looking at the tank's specifications. For example, a 275-gallon tank has a capacity of around 250 gallons, and the optimum delivery for that size is around 180 gallons.