Distance per Fuel
MPG (miles per gallon) measures how far a vehicle travels on one gallon of fuel. Higher is better: a 40 MPG car goes 40 miles on a gallon, a 20 MPG car only 20. Because it's distance per fuel, comparing vehicles by MPG can be misleading — see the inverse-conversion guide.
US vs Imperial
US gallons (3.785 L) are smaller than imperial gallons (4.546 L), so the same car shows a higher MPG number in the UK. A 40 US-MPG car is about 48 imperial MPG.
Reference
| US MPG | L/100km | Imperial MPG |
|---|---|---|
| 20 | 11.8 | 24 |
| 30 | 7.8 | 36 |
| 40 | 5.9 | 48 |
| 50 | 4.7 | 60 |