21.50 L/100km to MPG (US)
10.9 mpg
21.50 L/100km = 10.9 mpg.
MPG (US)
10.9mpg
21.5 L/100km = 10.9 mpg
The short answer
How many MPG (US) is 21.50 L/100km?
21.50 L/100km = 10.9 mpg. MPG (US) = 235.214583 ÷ L/100km, so the working is 235.214583 ÷ 21.50 = 10.9.
The working
L/100km and MPG (US) are reciprocals of each other, so the conversion is a division rather than a multiplication — which is why the two scales never line up evenly.
MPG (US) = 235.214583 ÷ L/100km 235.214583 ÷ 21.50 = 10.9
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (mpg) | Off by |
|---|---|---|
| Whole number | 11 | +0.05979 |
| 1 decimal | 10.9 | −0.04021 |
| 2 decimals | 10.94 | −0.00021 |
Round trip: take 10.9 mpg back the other way and you land on 21.5793 L/100km — a drift of 0.0793 L/100km. That gap is the rounding, not the conversion.
What 21.50 L/100km looks like
21.50 L/100km
A Bugatti Chiron, EPA rated at 11 mpg combined, amounts to roughly 21.4 litres of fuel per 100 kilometres.
Frequently asked questions
What is 21.50 L/100km in MPG (US)?
21.50 L/100km is 10.9 MPG (US). MPG (US) = 235.214583 ÷ L/100km, so the working is 235.214583 ÷ 21.50 = 10.9.
How accurate is 10.9 mpg?
Rounding to 10.9 mpg and converting straight back gives 21.5793 L/100km, a drift of 0.0793 L/100km from the 21.50 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
L/100km to MPG Converter
Convert L/100km to US MPG — turn a European economy figure into miles per gallon.
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