Miles per Gallon US (mpg US) to Miles per Gallon UK (mpg UK)

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Miles per Gallon US (mpg US) to Miles per Gallon UK (mpg UK) conversion table

Here are the most common conversions for Miles per Gallon US (mpg US) to Miles per Gallon UK (mpg UK) at a glance.

Miles per Gallon US (mpg US)	Miles per Gallon UK (mpg UK)
0.1	0.12009499
0.5	0.60047496
1	1.20094993
2	2.40189985
3	3.60284978
5	6.00474963
10	12.00949926
20	24.01899851
30	36.02849777
50	60.04749628
100	120.09499255

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Converting Miles per Gallon US (mpg US) to Miles per Gallon UK (mpg UK)

Fuel economy is the odd one out among conversions: it is usually a rate, and converting Miles per Gallon US (mpg US) to Miles per Gallon UK (mpg UK) means flipping between "fuel per distance" (liters per 100 km) and "distance per fuel" (miles per gallon) — which are mathematical inverses, not simple multiples. Better economy means a smaller L/100km number but a larger mpg number.

The Two MPG Problem

US gallons (3.785 L) and imperial gallons (4.546 L) differ by 20%, so "30 mpg" means two different things depending on which side of the Atlantic you are on — always check. The conversion everyone should know: 235.21 ÷ mpg (US) = L/100km, which lets you compare any car review worldwide.

Practical Tips

Comparing cars? Convert everything to L/100km — it is linear, so halving it truly halves your fuel bill, while mpg improvements have diminishing returns (going 10→20 mpg saves far more fuel than 30→40). For EVs, the emerging standard is kWh/100km or miles/kWh — same inverse logic.