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

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

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

Miles per Gallon UK (mpg UK)	Miles per Gallon US (mpg US)
0.1	0.08326742
0.5	0.41633709
1	0.83267418
2	1.66534837
3	2.49802255
5	4.16337092
10	8.32674185
20	16.65348369
30	24.98022554
50	41.63370923
100	83.26741846

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

Fuel economy is the odd one out among conversions: it is usually a rate, and converting Miles per Gallon UK (mpg UK) to Miles per Gallon US (mpg US) 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.