在 mpg、L/100 km 和 km/L 之间换算，支持美制和英制加仑：L/100 km = 235.215 ÷ US mpg 或 282.481 ÷ UK mpg。
更新于 已验证的示例：4
30 mpg (US)约为7.840486 L/100 km。 一个单位表示单位距离的耗油量，另一个表示单位燃油可行驶的距离，所以前者数值越大，后者越小。
| 单位 | 数值 | 定义 |
|---|---|---|
| 千米每升 (km/L) | 12.75431 | 基本单位 |
| 升每100千米 (L/100 km) | 7.840486 | km/L = 100 ÷ (L/100 km)，精确值 |
| 英里每美制加仑 (mpg (US)) | 30 | 1 mpg (US) = 1.609344/3.785411784 km/L，精确值 |
| 英里每英制加仑 (mpg (UK)) | 36.0285 | 1 mpg (UK) = 1.609344/4.54609 km/L，精确值 |
1 mpg (US) = 1.609344/3.785411784 km/L，精确值
km/L = 100 ÷ (L/100 km)，精确值
L/100 km表示单位距离的耗油量；mpg (US)表示单位燃油可行驶的距离。两者成反比：乘积始终为235.2146，所以一个加倍，另一个就减半。
两个单位的定义都精确，但换算结果为循环小数；结果显示12位有效数字。
Fuel economy comes in two shapes. Miles per gallon and kilometres per litre measure distance per unit of fuel; litres per 100 km measures fuel per distance. The two are reciprocals, so L/100 km = 100 ÷ (km/L), and a US mpg figure converts as L/100 km = 235.215 ÷ mpg.
The default converts 30 US mpg to 7.84 L/100 km. Comparing cars across markets is the usual reason: the US quotes mpg with a 3.785 L gallon, the UK quotes mpg with a 4.546 L gallon while selling fuel by the litre, most of Europe uses L/100 km and India uses km/L.
Because the scales are reciprocal, equal steps in mpg are not equal fuel savings: going from 10 to 20 mpg saves 5 gallons per 100 miles, while going from 30 to 50 mpg saves 1.33. The chart plots that curve.
核验来源：100 ÷ (30 × 1.609344 km / 3.785411784 L) = 112903/14400 (Python 3.8 fractions from the legal definitions)
核验来源：(100 / 10) km/L ÷ (1.609344/3.785411784) = 112903/4800 (Python 3.8 fractions from the legal definitions)
核验来源：40 × 3.785411784 / 4.54609 (Python 3.8 fractions from the legal definitions)
核验来源：100 / 10 = 10 — the one value where km/L and L/100 km coincide
Divide 235.215 by a US mpg figure, or 282.481 by a UK mpg figure. 30 US mpg is 7.84 L/100 km and 50 UK mpg is 5.65 L/100 km. The constants are 100 × 3.785411784 ÷ 1.609344 and 100 × 4.54609 ÷ 1.609344, built from the exact gallon and mile.
Because the imperial gallon is 20% larger: 4.54609 L against 3.785411784 L. A car doing 40 mpg on UK figures does 33.3 mpg in US gallons, and 40 US mpg is 48.0 UK mpg. Both describe the same fuel use; 40 UK mpg is 7.06 L/100 km.
Because fuel used is distance divided by mpg. Over 100 miles, 10 mpg burns 10 gallons and 20 mpg burns 5, a saving of 5; 30 mpg burns 3.33 and 50 mpg burns 2, a saving of 1.33. Larrick and Soll called this the “MPG illusion” (Science, 2008); L/100 km avoids it because it measures fuel directly.
Divide 100 by the km/L figure: 20 km/L is 5 L/100 km and 12.5 km/L is 8 L/100 km. At 10 km/L the two numbers are equal. To go from km/L to US mpg, multiply by 2.35215, so 15 km/L is 35.3 US mpg.
Yes. L/100 km counts fuel used, so a smaller number means less fuel: 5 L/100 km is twice as economical as 10 L/100 km. With mpg and km/L a larger number is better. The product of the two stays fixed, 235.215 for L/100 km and US mpg, which is why one falls as the other rises.
准确性取决于输入值和方法的假设。十进制运算使用50位有效数字，但估算、数值方法和源数据的精度可能较低；显示时的舍入并不能消除这些限制。 已按独立来源核验的计算示例：4。 例如，“30 mpg (US) in L/100 km”根据100 ÷ (30 × 1.609344 km / 3.785411784 L) = 112903/14400 (Python 3.8 fractions from the legal definitions)进行核验。
NIST SP 811 (2008), Guide for the Use of the SI, Appendix B — conversion factors; NIST Handbook 44, Appendix C — General tables of units of measurement.
此计算器包含 4 个已解示例，答案来自独立来源。这些示例会在测试套件中运行，你也可以在此运行验证。