How much gas does a 900-mile road trip cost?

At 30 MPG, a 900-mile trip uses about 30 gallons. At $3.50 per gallon, the estimated fuel cost is $105.

The formula

Trip fuel cost is calculated in two steps: divide total trip miles by expected miles per gallon to estimate gallons used, then multiply gallons by the expected price per gallon. The compact formula is (miles ÷ MPG) × gas price.

Why your real result may be different

Actual fuel economy changes with speed, traffic, weather, vehicle load, tire pressure, terrain, air-conditioning use, and driving style. Gas prices can also change significantly across a long route. For budgeting, use the MPG you normally see on similar highway driving rather than assuming the best-case rating.

What about tolls and parking?

Fuel is only one part of a driving budget. If the trip includes toll roads, paid parking, or other vehicle costs, use the full Road Trip Cost Calculator instead. That lets you combine fuel with toll and parking estimates before comparing driving with another travel option.

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