Question 1

Why is UK MPG higher than US MPG?

Accepted Answer

UK Imperial gallon = 4.546 liters. US gallon = 3.785 liters. Imperial gallon is 20% larger, so same efficiency appears as higher MPG in UK. US 30 MPG = UK 36 MPG.

Question 2

How do I convert between US and UK MPG?

Accepted Answer

MPG (UK) = MPG (US) × 1.201. MPG (US) = MPG (UK) × 0.833. Example: 30 MPG (US) = 36 MPG (UK).

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.

mpg (US) to mpg (UK) Converter

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