The 4-Gallon Minimum Fuel Rule Explained: Which Fuel Does It Apply To?

Some filling stations in certain markets post a minimum-purchase notice at the pump: the transaction will not be authorized unless at least four gallons of fuel are dispensed. The rule is a station-level policy rather than a national fuel standard, and it is usually tied to how the sale is paid for rather than to the type of fuel itself.

So which fuel does it cover? In practice, the minimum applies to whatever grade the pump is set to deliver, which in most cases means regular and premium gasoline. Whether diesel falls under the same requirement depends entirely on the individual station, and many outlets apply it only to card transactions. Drivers should read the sticker on the dispenser before lifting the nozzle, because a four-gallon threshold on one pump may