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Enter your assumptions above and calculate locally in this browser. No data is uploaded.
How this calculator works
Extra litres = annual distance × baseline L/100km × assumed percentage change / 10,000.
Important: No universal fuel penalty can be inferred from tyre pressure. Follow the door-jamb/OEM cold-pressure specification, not this scenario.
Illustrative inputs only. This is not official vehicle safety, valuation or legal advice.