How the estimate works
Fuel cost is simply distance ÷ fuel economy × price per gallon. The calculator doubles the distance for round trips, adds any tolls and parking, then divides the total by however many people are sharing the ride. The vehicle-class comparison recomputes the same trip at typical MPG figures so you can see instantly what borrowing the hybrid instead of taking the truck is worth.
Use your real-world MPG, not the sticker
Window-sticker ratings assume ideal conditions. Loaded with passengers and luggage, running the AC, or holding 75+ mph, most vehicles do noticeably worse — a car rated 32 highway might deliver 27–28 on a real interstate run. If you know your car's actual average from the dash computer or a fuel log, choose Custom and enter it; your estimate will be far more accurate.
Splitting fairly
The per-person figure divides the entire cost — fuel plus tolls — evenly among everyone in the car, driver included. Some groups prefer the driver to pay nothing in exchange for providing the car and doing the driving; if that's your arrangement, set the passenger count to riders only and the split updates instantly.
Miles or kilometers, gallons or liters
Fuel economy is written differently around the world: the US uses MPG, Europe uses liters per 100 km (lower is better), and much of Asia uses kilometers per liter (higher is better). This calculator supports all three plus EV efficiency in mi/kWh or kWh/100km, and converts your numbers automatically when you switch — so the same trip can be checked in any convention without redoing the math.