Accurate measurement is important when you buy gasoline and motor fuel. A computer in the gasoline pump calculates what you owe based on the amount and the unit price of the gasoline. When comparing prices, be sure to compare gasoline with the same octane rating. Usually, the higher the octane rating, the higher the price.

Inspectors from the Consumer Department's Weights & Measures Division regularly check gasoline pumps for accuracy. This video shows how an inspection is conducted. In many areas, they also check gasoline storage tanks to be sure that stations are selling the octane level advertised. If violations are found, the seller can be fined and the product removed. Look for the Weights & Measures Seal on the pump.

Gasoline stations may offer a discount if you pay with cash instead of using a credit card. This "cash discount" is at least cents per gallon lower than the credit price. On most gas pumps, you are able to push a button to automatically show the discounted price. In some cases, the attendant must figure out the cash discount and deduct it from the price showing on the pump.

What You Can Do

  • Be sure that you or the attendant is using the correct pump. The octane rating and the price per gallon 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 the total due.
  • Figure the cash discount, if any. Check that you are charged the right amount.
  • If using a credit card, check the receipt to be sure the amount billed is the amount on the pump.

If you have a problem or question that is not resolved with at the gas station, contact Weights and Measures at  or call (914) 995-2155.