Gallons US per 100 Miles (gal US/100 mi) to Miles per Gallon UK (mpg UK)

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Gallons US per 100 Miles (gal US/100 mi) to Miles per Gallon UK (mpg UK) conversion table

Here are the most common conversions for Gallons US per 100 Miles (gal US/100 mi) to Miles per Gallon UK (mpg UK) at a glance.

Gallons US per 100 Miles (gal US/100 mi)	Miles per Gallon UK (mpg UK)
0.1	1,200.94992550
0.5	240.18998510
1	120.09499255
2	60.04749628
3	40.03166418
5	24.01899851
10	12.00949926
20	6.00474963
30	4.00316642
50	2.40189985
100	1.20094993

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Converting Gallons US per 100 Miles (gal US/100 mi) to Miles per Gallon UK (mpg UK)

Fuel economy is the odd one out among conversions: it is usually a rate, and converting Gallons US per 100 Miles (gal US/100 mi) 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.