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

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

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

Gallons UK per 100 Miles (gal UK/100 mi)	Miles per Gallon US (mpg US)
0.1	832.67418463
0.5	166.53483693
1	83.26741846
2	41.63370923
3	27.75580615
5	16.65348369
10	8.32674185
20	4.16337092
30	2.77558062
50	1.66534837
100	0.83267418

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

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