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Fuel economy is distance travelled ÷ fuel consumed, giving km/L. Fill the tank, note the odometer, drive, refill, and enter the distance and litres for a real figure.
A single brim-to-brim measurement over a decent distance smooths out fill-level guesswork. One short trip can mislead; average a few tanks for a dependable number.
That is the promise behind every tool here. Files are read in your browser tab, processed there, and discarded when you close it — never uploaded to our servers.
