25 mpg (US) to mpg (UK) — 25 US miles per gallon in Imperial miles per gallon
25 mpg (US) → 30.023748 mpg (UK)
25 US miles per gallon in other units
| Litres per 100 km | 9.408583 | L/100 km |
|---|---|---|
| Imperial miles per gallon | 30.023748 | mpg (UK) |
| Kilometres per litre | 10.628593 | km/L |
| Miles per litre | 6.604301 | mi/L |
mpg (US) to mpg (UK) at a glance
| US miles per gallon | Imperial miles per gallon |
|---|---|
| 1 mpg (US) | 1.20095 mpg (UK) |
| 2 mpg (US) | 2.4019 mpg (UK) |
| 3 mpg (US) | 3.60285 mpg (UK) |
| 5 mpg (US) | 6.00475 mpg (UK) |
| 10 mpg (US) | 12.009499 mpg (UK) |
| 20 mpg (US) | 24.018999 mpg (UK) |
| 25 mpg (US) | 30.023748 mpg (UK) |
| 50 mpg (US) | 60.047496 mpg (UK) |
| 100 mpg (US) | 120.094993 mpg (UK) |
| 250 mpg (US) | 300.237481 mpg (UK) |
| 500 mpg (US) | 600.474963 mpg (UK) |
| 1,000 mpg (US) | 1,200.95 mpg (UK) |
How to convert US miles per gallon to Imperial miles per gallon
Multiply by 1.20095 — one US mile per gallon is 1.20095 Imperial miles per gallon.
Working 25 mpg (US) → 30.023748 mpg (UK)
In words: about thirty Imperial miles per gallon.
Questions
How many Imperial miles per gallon are in a US mile per gallon?
One US mile per gallon is 1.20095 Imperial miles per gallon.
What is 25 US miles per gallon in Imperial miles per gallon?
25 US miles per gallon is 30.023748 Imperial miles per gallon. The working is 25 mpg (US) → 30.023748 mpg (UK).
Why can't I convert mpg with a simple multiplier?
Because the two measures run in opposite directions. Miles per gallon counts distance per unit of fuel; litres per 100 km counts fuel per unit of distance. One is the reciprocal of the other, so you divide rather than multiply.
Why is UK mpg always a bigger number than US mpg?
The Imperial gallon is about 20% larger, so the same car travels further on one of them. A car rated 30 mpg in the US is around 36 mpg in the UK, with nothing about the car having changed.
Going from 15 to 20 mpg, or 30 to 40 mpg — which saves more fuel?
The first, by a wide margin. Over 10,000 miles the 15-to-20 change saves about 167 gallons; the 30-to-40 change saves about 83. This is exactly the trap the inverse relationship sets, and why litres per 100 km is the easier measure to reason with.