AutoEngCalc - Engineering Calculators

Fuel Efficiency Calculator

Calculate fuel economy in MPG (US/UK), L/100km, km/L. Instant conversion and trip fuel cost estimation for gasoline, diesel and electric vehicles.

Fuel Economy
35 MPG
500 km • 50 liters

Fuel Economy & Cost

Featured: MPG • L/100km • Trip Cost • EV Equivalent

per liter/gallon

Efficiency Comparison

Common vehicle types

Conversion Formulas
MPG (US) = miles / US gallons
L/100km = (liters × 100) / km
MPG (US) = 235.215 / L/100km
km/L = 100 / L/100km

Enter distance and fuel used

Fuel Economy Benchmarks

Typical Values

Compact car: 35–45 MPG

SUV: 20–30 MPG

Hybrid: 50+ MPG

EV equivalent: 3–4 mi/kWh ≈ 100+ MPGe

L/100km Guide

Excellent: <6 L/100km

Good: 6–8 L/100km

Average: 8–10 L/100km

Poor: >12 L/100km

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