Guides
Plain-language explanations of how fuel prices work, how to read official price data, and how to spend less on fuel.
- What’s in a Gallon of Gas? How Gasoline Prices Are SetCrude oil, refining, distribution and taxes: the four parts of the pump price and why prices differ by region.
- How to Read EIA Gas Price DataHow EIA's weekly survey works, what PADD regions are, and which states and cities have their own prices.
- Diesel vs. Gasoline: Engines, Mileage and PricesHow diesel and gasoline differ, why their prices move differently, and how to compare costs.
- Regular vs. Premium Gas: Do You Need Premium?What octane means, "required" vs. "recommended", and common myths about premium fuel.
- Fuel-Saving Tips That Actually WorkSimple driving, maintenance and buying habits that cut your fuel bill.