Useful for a single destination drive when you want a quick gas budget before booking the trip.

Result: A round-trip drive lands around the mid-$40s in fuel with cost-per-mile still easy to compare against other transport options.

A fuel-efficient highway drive where a modest MPG improvement still saves real money over the full distance.

Result: Longer routes make the per-mile math more useful than the raw tank refill intuition.

Heavier vehicles and cargo change trip cost quickly, especially when the route is doubled for the return.

Result: A lower-MPG vehicle can push the same outing well past the budget of a lighter commuter car.