Whether your heating oil tank is aboveground outdoors, or in your basement, you can look on top of the tank for a device similar to the one shown here.
The approximate amount of fuel you have will be displayed in fractions.
Remember, the minimum amount of fuel for a delivery is 150 gallons. Any less and a short load fee will be applied. Contact Customer Service at 800-874-1975 for details. Note: To allow for fuel expansion and safe deliveries, an oil tank holds slightly less fuel than its official full capacity.