Compute fuel cost from consumption, or from distance and fuel economy, and the unit fuel price, including cost per 100 km.
费用 = 用量 × 单价。
| Item | Formula / Rule | Source / Standard |
|---|---|---|
| Cost formula | Fuel cost equals quantity times unit price, with quantity converted to a consistent measurement unit. | ISO 80000-5:2019, quantities and units in thermodynamics |
| Volume to mass conversion | Volume and mass are converted through density, which must be taken at the measured temperature. | ISO 3675:1998 & ISO 12185:1996, determination of density of petroleum products |
| Equal-energy price comparison | Different fuels should be compared on a heating-value-adjusted basis to be comparable. | ISO 1928:2009 & GB/T 2589-2020 |