Mpg Us to Mpg Uk Converter
Convert US MPG to UK MPG easily. Free fuel economy converter for vehicles.
Formula
mpg (UK) = mpg (US) × 1.20095
Common Conversions
How to Convert US MPG to UK MPG
Multiply US MPG by 1.2009 to get UK MPG. So 30 US MPG × 1.2009 = 36 UK MPG. Same vehicle, higher UK number because the UK gallon is bigger (4.546 L vs 3.785 L US).
Useful when interpreting US car spec sheets in UK context. A 2024 Toyota Prius at 56 US MPG = 67.2 UK MPG. A Tesla Model 3 LR rated at 132 MPGe (electric equivalent) US = 158.5 MPGe UK. The UK MPG number is always higher for the same vehicle.
US MPG to UK MPG
| US MPG | UK MPG |
|---|---|
| 15 | 18.01 |
| 20 | 24.02 |
| 25 | 30.02 |
| 30 | 36.03 |
| 40 | 48.04 |
| 50 | 60.05 |
| 60 | 72.06 |
| 100 | 120.09 |
Frequently Asked Questions
Why do American cars seem to get worse MPG?
Smaller gallon, so the MPG figure is intrinsically lower. A US car at 30 MPG actually averages similar fuel consumption to a UK car at 36 MPG. Plus, American cars have historically been larger/heavier, which is real. The '20% gallon difference' adds to the apparent gap.
Does the EPA test the same way as the UK?
Different test cycles. US EPA: 5 different cycles including high-speed and aggressive accel. UK/EU WLTP: 4 cycles, more representative of mixed real driving (post-2017). Same car will have somewhat different rated MPG figures even after the gallon conversion.
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