Interactive Car Mileage Calculator

Fuel economy is calculated based on distance driven divided by fuel consumed. Under the Imperial system, it is expressed as **MPG (Miles Per Gallon)**: Under the Metric system, it is commonly expressed as **L/100km (Liters consumed per 100 kilometers traveled)**:

A US liquid gallon is equivalent to exactly **3.785411784 liters**, while an Imperial (UK) gallon is larger, equivalent to exactly **4.54609 liters** (roughly 20% larger than a US gallon). Because of this discrepancy, the UK Miles per Gallon rating will look higher than the US Miles per Gallon rating for the exact same trip. This calculator prints both outputs side-by-side in the equivalency grid to support international users.

Carbon dioxide emissions are directly tied to the volume of fuel burned and its density. The EPA and international environmental bodies estimate the following CO₂ constants:

• Gasoline / Petrol: ~2.31 kilograms of CO₂ per Liter consumed (~8.89 kg/US Gallon)
• Diesel Fuel: ~2.68 kilograms of CO₂ per Liter consumed (~10.16 kg/US Gallon)

Diesel engines release more carbon dioxide per liter of fuel burned because diesel has a higher carbon density, though they typically operate at higher thermal efficiency (burning less fuel overall).

You can increase your fuel economy by implementing the following habits:

• Maintain Steady Speeds: Speeding, rapid acceleration, and braking aggressively wastes significant fuel. Use cruise control on highway stretches.
• Keep Tires Properly Inflated: Underinflated tires increase rolling resistance, reducing fuel economy by up to 3%.
• Reduce Excess Weight: Remove heavy objects from your vehicle's trunk and avoid empty roof racks that create aerodynamic drag.
• Minimize Engine Idling: Turn off your engine if you are waiting in a parked car for more than a minute to conserve fuel.