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Automotive 1 use Updated August 10, 2026

Trip Fuel Consumption Calculator

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Enter Fuel Capacity In Gallons For All Tanks
Enter Gallons Per Hour (GPH) Consumption Rating
Enter Trip Time Elapsed In Hours
Enter Start Of Trip Fuel In Gallons In All Tanks

This fuel consumption calculator finds your real fuel economy from the fuel used and the distance driven, in L/100km or MPG. Enter both values above.

Formulas

L/100km = Fuel used (L) ÷ Distance (km) × 100
MPG = Distance (mi) ÷ Fuel used (gal)

Example

40 L over 500 km: consumption = 40 ÷ 500 × 100 = 8 L/100km.

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Frequently Asked Questions

How do I calculate fuel consumption?

Divide the fuel used by the distance and multiply by 100 for L/100km, or divide miles by gallons for MPG.

What is a good L/100km figure?

Around 5 to 8 L/100km is efficient for a small car; larger vehicles use more.

How do I convert L/100km to MPG?

Divide 235.2 by the L/100km value to get US MPG.

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