Planning a road trip across the United States? One of the most important costs to budget for is gasoline. With the national average sitting at $4.44 per gallon in June 2026, fuel costs can add up quickly on long drives. The good news is that calculating your road trip gas cost is simple — and our free calculator at usgasprices.online makes it even easier.
The Simple Formula
Step by Step Guide
Step 1 — Find Your Trip Distance
Use Google Maps to find the total driving distance of your route. Enter your starting point and destination, and Google will show you the distance in miles. For multi-stop trips, add up the distance between each stop.
Step 2 — Know Your Car's MPG
Your car's fuel efficiency (miles per gallon) is listed in your owner's manual or on the window sticker. You can also find it at fueleconomy.gov — the official US government fuel economy database. Here are typical MPG figures by vehicle type:
- Small car (Toyota Corolla, Honda Civic) — 30-35 MPG
- Midsize sedan (Toyota Camry, Honda Accord) — 25-32 MPG
- SUV (Toyota RAV4, Honda CR-V) — 25-30 MPG
- Large SUV (Chevy Suburban, Ford Expedition) — 15-20 MPG
- Pickup truck (Ford F-150, Chevy Silverado) — 18-24 MPG
- Minivan (Honda Odyssey, Chrysler Pacifica) — 22-28 MPG
Step 3 — Check Current Gas Prices
Use our live gas price tracker to see current average prices in each state you'll be driving through. If your road trip crosses multiple states, use the price for the state where you plan to fill up most often — or average the prices across your route.
Real Road Trip Examples
Pro Tips for Road Trip Gas Savings
- Fill up in cheap states — If your route passes through Texas or other low-price states, fill up there before entering expensive states
- Use cruise control — Maintains steady speed and saves 7-14% fuel on highways
- Check prices before each fill-up — Use GasBuddy to find the cheapest station ahead on your route
- Don't wait until empty — Having flexibility means you can skip expensive stations
- Avoid roof racks if possible — Aerodynamic drag from empty roof racks reduces MPG by 5-25% at highway speeds
Visit usgasprices.online and scroll down to the Road Trip Calculator. Enter your miles, MPG, and we automatically fill in the current national average gas price. Get your exact fuel cost in seconds — free, no signup needed.
Gas Prices Across Popular Road Trip States
| State | Regular Price | Good for Fill-Up? |
|---|---|---|
| Texas | $2.97 | ✅ Yes — very cheap |
| Florida | $3.29 | ✅ Good value |
| Tennessee | $3.09 | ✅ Fill up here |
| New York | $3.85 | ⚠️ Above average |
| Nevada | $4.51 | ❌ Fill up in Utah |
| California | $5.97 | ❌ Fill up before entering |
Planning your fill-up stops around cheaper states can save you $20-50 on a typical cross-country road trip. Check the live price map before you leave to see current prices in every state on your route.