Refueling a car in the USA
Filling up in America is mostly easy, with a few habits that catch visitors out: prepaying, the odd state where you can't pump your own, and a ZIP-code quirk that trips up foreign cards. Here's the whole picture — with what fuel actually costs right now.
Gas is sold by the US gallon(about 3.79 litres) and priced to a tenth of a cent. Stations are everywhere along the interstates and thin out in the rural West, so on a long empty stretch it's worth filling up before you drop below a quarter tank. What you pay swings a lot by state — see the US fuel-price map for the current picture.
Cheapest and priciest states
Extremes of the latest weekly regular-gasoline figures across states, from the U.S. Energy Information Administration. For the official US national average (volume-weighted, not a simple mean of states), see the EIA Gasoline and Diesel Fuel Update.
Pay at the pump, or prepay inside
There are two ways to pay. Pay at the pump: tap or insert a card in the reader on the pump, fill up, take the receipt. Prepay inside: tell the cashier your pump number and either hand over a card or pay cash for a set dollar amount, then pump. Many stations — especially overnight — won't switch a pump on until you've paid, so prepay is common and normal.
Card readers at the pump usually ask for a US billing ZIP code, which is where visitors get stuck — see using a foreign card at US gas stations. The full step-by-step is in how to pump gas in the USA.
Self-service almost everywhere
In 49 states you pump your own gas. The exception is New Jersey, where an attendant must do it for you by law under the Retail Gasoline Dispensing Safety Act — stay in the car, tell them the grade and amount, and don't tip. Oregon only legalised self-service statewide in 2023 (House Bill 2426), so you'll still meet attendants there. Full details in full-service gas: New Jersey, Oregon and pumping your own.
Octane, diesel and gallons
US pumps offer three unleaded grades — regular (87), mid-grade (88–90) and premium (91–94) — and by law the octane rating is posted on every pump (FTC Fuel Rating Rule). A regular fill is right for almost every rental car. Dieselcomes from separate pumps at its own price — don't put it in a petrol car. The EIA glossary has the exact octane bands.
US gas station chains
You'll pass dozens of brands. The national majors price close to the local average; warehouse clubslike Costco are usually cheapest but need a membership; and there's a whole tier of cult regional chains and interstate truck stops worth planning a stop around. A short field guide:
National fuel brands
The big oil-branded stations you'll see everywhere. Prices track the local average; the draw is coverage and a loyalty app.
- Shell →
The widest US footprint of the majors, with the Shell Fuel Rewards app.
- ExxonMobil (Exxon / Mobil) →
Two big brands under one owner; the Exxon Mobil Rewards+ app covers both.
- Chevron →
Dominant in the West; also owns the Texaco brand.
- BP (and Amoco) →
Nationwide, with the BPme rewards app and the budget Amoco sub-brand.
- Marathon →
The largest US refiner's own-brand stations, strong in the Midwest and South.
- Phillips 66 / 76 / Conoco →
Three sibling brands; "76" is the classic orange ball of the West Coast.
- Valero →
A major refiner with a big Texas and Sun Belt presence.
- Sunoco →
Common in the Northeast and Mid-Atlantic; the official fuel of NASCAR.
- Citgo →
Widespread in the East and Midwest.
Warehouse clubs (cheapest, membership)
Members-only clubs sell some of the cheapest fuel in the country — worth it if you're already a member or driving a lot.
- Costco →
Reliably among the cheapest fuel anywhere — but you need a membership to buy.
- Sam's Club →
Walmart's warehouse club; members-only fuel that undercuts the local average.
- BJ's Wholesale Club →
East-coast warehouse club with discounted members' fuel.
Regional favourites
Cult-favourite chains that dominate a corner of the map, often with a serious food counter and clean restrooms.
- Buc-ee's →
Enormous Texas/Southeast destination stations — dozens of pumps and a famous food hall.
- Wawa →
Mid-Atlantic institution known for made-to-order hoagies and coffee.
- Sheetz →
Appalachian favourite with a full touchscreen-ordered food menu.
- QuikTrip (QT) →
Highly-rated Midwest/South chain with a strong fresh-food program.
- Kwik Trip / Kwik Star →
Upper-Midwest favourite (Kwik Star in Iowa) known for bakery and dairy.
- Casey's →
Small-town Midwest staple — and one of the largest US pizza sellers.
- RaceTrac →
Big, bright Southeast stores with lots of pumps and frozen drinks.
- Maverik →
"Adventure's First Stop" across the Mountain West, with hot fresh food.
Interstate travel centers
Built for the interstate and for trucks: hundreds of pumps, diesel lanes, showers, food courts and parking.
- Pilot Flying J →
The biggest interstate travel-center network; diesel lanes, food and showers.
- Love's Travel Stops →
Ubiquitous on the interstates, with fuel, food and truck parking.
- TravelCenters of America (TA / Petro) →
Full-service highway stops for cars and trucks — fuel, restaurants, service bays.
Convenience-store chains
Corner-store chains where fuel is a sideline to coffee, snacks and a quick stop.
- Circle K →
One of the largest convenience chains, nationwide, with the Inner Circle rewards app.
- 7-Eleven / Speedway →
The convenience giant (which now owns Speedway) with fuel at many locations.
More on each tier in US gas station chains explained.
Frequently asked questions
- Can you pump your own gas everywhere in the US?
- Almost. Self-service is standard in 49 states. New Jersey is the one exception where an attendant must pump for you by law, and Oregon only legalised self-service statewide in 2023, so you'll still meet attendants there.
- Why was my foreign card declined at the gas pump?
- US pumps often ask for the ZIP code tied to your card's billing address, and that check (called AVS) doesn't recognise non-US addresses, so the pump rejects the card. Paying inside at the counter, or prepaying a set dollar amount, avoids the ZIP prompt.
- Do US gas stations make you pay before you pump?
- Many do — either tap/insert a card at the pump first, or prepay a dollar amount inside. It's especially common overnight. If you prepay cash for more than you use, you go back inside for change.
- What octane gas should I put in a rental car?
- Regular (87 octane) is right for almost every rental. Mid-grade and premium cost more and aren't needed unless the car specifically calls for premium. Fuel is sold by the US gallon, which is about 3.79 litres.
- Where is gas cheapest in the US?
- It varies by state, driven mostly by fuel taxes and distance from refineries — Gulf Coast and southern states tend to be cheapest, the West Coast the priciest. The RoadRange fuel-price map shows the current spread, and warehouse clubs like Costco often beat the local average.