30 mpg (US) is 7.84 L/100 km. Divide 235.21 by the mpg figure to convert any value.
| Miles per US gallon (mpg) | Liters per 100 km |
|---|---|
| 10 | 23.52 |
| 11 | 21.38 |
| 12 | 19.60 |
| 13 | 18.09 |
| 14 | 16.80 |
| 15 | 15.68 |
| 16 | 14.70 |
| 17 | 13.84 |
| 18 | 13.07 |
| 19 | 12.38 |
| 20 | 11.76 |
| 21 | 11.20 |
| 22 | 10.69 |
| 23 | 10.23 |
| 24 | 9.80 |
| 25 | 9.41 |
| 26 | 9.05 |
| 27 | 8.71 |
| 28 | 8.40 |
| 29 | 8.11 |
| 30 | 7.84 |
| 31 | 7.59 |
| 32 | 7.35 |
| 33 | 7.13 |
| 34 | 6.92 |
| 35 | 6.72 |
| 36 | 6.53 |
| 37 | 6.36 |
| 38 | 6.19 |
| 39 | 6.03 |
| 40 | 5.88 |
| 41 | 5.74 |
| 42 | 5.60 |
| 43 | 5.47 |
| 44 | 5.35 |
| 45 | 5.23 |
| 46 | 5.11 |
| 47 | 5.00 |
| 48 | 4.90 |
| 49 | 4.80 |
How it is computed
L/100 km = 100 × 3.785411784 ÷ 1.609344 ÷ mpg. The two scales are inverses: mpg is distance per fuel, L/100 km is fuel per distance.
FAQ
Why does the curve flatten at high mpg?+
Because L/100 km is the reciprocal. Going from 10 to 20 mpg saves 11.8 L/100 km; from 40 to 50 saves only 1.2.
What about UK mpg?+
UK mpg uses the larger imperial gallon, so the constant becomes about 282.48 instead of 235.21.