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Unit family
Fuel economy
mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.
| Unit | Symbol | Formula |
|---|---|---|
| Litres per 100 kilometres | l/100 km | base |
| Kilometres per litre | km/l | km/l = 100 / l/100 km |
| Miles per US gallon | mpg US | mpg US = 235.214583 / l/100 km |
| Miles per imperial gallon | mpg imp | mpg imp = 282.480936 / l/100 km |
mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.
Sources
Search and practice paths
Search and practice paths
FormulaTableExamplesCommon mistakeEveryday/engineeringExcel/CSVBatch converterPrint view
Factors come from the stored source family and are not derived from rounded display values.
UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.
Do not use as the sole basis for official, medical, safety-critical or contractual decisions.
Citation note: UnitCloud, conversion with formula, sources current as of May 2026. Fuel economy. Source basis: NIST Guide to SI Appendix B.
Common questions
Which base unit does Fuel economy use?
UnitCloud normalises this family through l/100 km. That keeps tables, direct conversions and batch output consistent.
What is the most common mistake for Fuel economy?
mpg and l/100 km move in opposite directions. Higher mpg means lower consumption; higher l/100 km means higher consumption.
How does UnitCloud round?
UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.
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