Fuel Efficiency Conversion: MPG, km/L, and L/100 km

Use this guide when a converted number affects work such as vehicle labels, fuel logs, route comparisons, and fuel budgets. A converted value is ready to use only when the source value, target unit, conversion factor, and rounding decision are visible.

The goal is not to memorize every factor. The goal is to make the path auditable: original value, unit choice, conversion factor, result, and final rounding.

• Remember that L/100 km gets smaller when efficiency improves.
• Confirm the source and target unit labels before typing the value.
• Keep extra digits while calculating and round only for the final use.
• Keep the original value beside the converted value for review.

1. Write down the original number and unit before changing anything.
2. Choose the target unit required by the drawing, form, calculation, or reader.
3. Convert with enough digits to avoid rounding too early.
4. Review the result against a known example or calculator output before sharing it.

Treat the examples below as repeatable checks, not as replacements for required standards. Keep the original value beside the converted value, preserve extra digits while calculating, and round only for the decision being made.

Use these tools to check the numbers in this guide without switching context.

A useful conversion is traceable: it shows the original unit, the target unit, the factor used, and the rounding decision.