Be sure you or the attendant are using the correct pump. The octane rating and the price per gallon or liter should be clearly marked on each pump. Be sure the pump is set to zero before any gasoline is pumped. Check the price by multiplying the number of gallons by the unit price. Be sure this shows as the total due or if you are pumping the gasoline stop the pump at exactly 10 gallon s to simply check the total for correctness.
Some gasoline stations market their least expensive gasoline as economy brand.
Since regular is most commonly the least expensive brand, some consumers mistakenly order regular thinking they will receive the lowest priced gasoline. Be careful to order the correct brand. All prices posted have to agree. If a price is posted lower than what is charged at the pump, the station is not in compliance with the law. All grades of gasoline must posted at the dispenser with the price and octane quality.