20 MPG (US) to L/100km
11.8 L/100km
20 mpg = 11.8 L/100km.
L/100km
11.8L/100km
20 mpg = 11.8 L/100km
The short answer
How many L/100km is 20 MPG (US)?
20 mpg = 11.8 L/100km. L/100km = 235.214583 ÷ MPG (US), so the working is 235.214583 ÷ 20 = 11.8.
The working
MPG (US) and L/100km 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.
L/100km = 235.214583 ÷ MPG (US) 235.214583 ÷ 20 = 11.8
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 (L/100km) | Off by |
|---|---|---|
| Whole number | 12 | +0.23927 |
| 1 decimal | 11.8 | +0.03927 |
| 2 decimals | 11.76 | −0.00073 |
Round trip: take 11.8 L/100km back the other way and you land on 19.9334 mpg — a drift of 0.0666 mpg. That gap is the rounding, not the conversion.
What 20 mpg looks like
20 mpg
The CAFE schedule Congress wrote required carmakers to reach a 20.0 mpg passenger car fleet average by model year 1980.
Frequently asked questions
What is 20 MPG (US) in L/100km?
20 MPG (US) is 11.8 L/100km. L/100km = 235.214583 ÷ MPG (US), so the working is 235.214583 ÷ 20 = 11.8.
How accurate is 11.8 L/100km?
Rounding to 11.8 L/100km and converting straight back gives 19.9334 mpg, a drift of 0.0666 mpg from the 20 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
MPG to L/100km Converter
Convert US MPG to L/100km — read a car’s economy the way the rest of the world quotes it.
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