Worked example
A 250-mile one-way trip at 45 MPG and 145p/litre costs about £36.63 in fuel, or roughly £73.26 return.
Frequently asked questions
Does this include tolls, parking or ferries?
No. Add those separately because they vary by route.
Can I use motorway MPG?
Yes. If the trip is mostly motorway, use the MPG you realistically expect at motorway speeds.