Question 1

What are the different fuel economy units?

Accepted Answer

MPG (US): miles per US gallon. MPG (UK): miles per Imperial gallon. L/100km: liters per 100 kilometers. km/L: kilometers per liter. Higher MPG = better; lower L/100km = better.

Question 2

Why do countries use different fuel economy units?

Accepted Answer

US uses MPG (miles per gallon). Europe uses L/100km (consumption per distance). Australia, Japan use km/L. The metric L/100km shows actual fuel used, while MPG shows distance capability.

Question 3

Why does the US use MPG while others use L/100km?

Accepted Answer

MPG (higher = better) is intuitive for comparing. L/100km (lower = better) better shows fuel savings - halving consumption halves L/100km but doesn't double MPG.

Question 4

How does speed affect fuel economy?

Accepted Answer

Most vehicles are most efficient at 45-65 mph. Above 65 mph, every 5 mph increase is like paying an extra $0.20-0.30 per gallon.

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