Implied preemption is a controversial doctrine, because this preemption may be significantly harder to prevent than either outright or express preemption. As such, some states have outlawed implied preemption.
Costumers often wonder how much oil to order to take advantage of our discount pricing. We have placed this helpful chart on our website for your convenience. A standard residential oil tank holds 275 gallons. To order 150 gallons or more, please call us when your tank reads 3/8 full or below.
As was stated before the nominal tank capacity is 11.9 gallons. You don't want to run out of gas (my gas guage is not accurate, this was a problem in '04 and '05 Prii) so assume a capacity of 11 or less in the summer and 10 or less in the winter to be safe.