MPG US to MPG UK Conversion Chart
| Miles per Gallon (US) (mpg) | Miles per Gallon (UK) (mpg uk) | Reference Benchmark | Formula Step |
|---|---|---|---|
| 10 mpg | 12.01 mpg uk | Heavy Heavy-Duty Commercial Pickup Truck Rating | 10 × 1.20095 = 12.01 mpg UK |
| 15 mpg | 18.01 mpg uk | Full-Size V8 Passenger SUV Highway Fuel Economy | 15 × 1.20095 = 18.01 mpg UK |
| 20 mpg | 24.02 mpg uk | Mid-Size All-Wheel Drive Crossover Combined Rating | 20 × 1.20095 = 24.02 mpg UK |
| 25 mpg | 30.02 mpg uk | Standard Four-Cylinder Compact SUV Commuter Vehicle | 25 × 1.20095 = 30.02 mpg UK |
| 30 mpg | 36.03 mpg uk | Efficient Turbocharged Four-Cylinder Highway Sedan | 30 × 1.20095 = 36.03 mpg UK |
| 35 mpg | 42.03 mpg uk | Modern Compact Hatchback Combined Highway Efficiency | 35 × 1.20095 = 42.03 mpg UK |
| 40 mpg | 48.04 mpg uk | Subcompact City Commuter Gas Vehicle Benchmark | 40 × 1.20095 = 48.04 mpg UK |
| 45 mpg | 54.04 mpg uk | Full Hybrid Mid-Size Passenger Sedan Fleet Rating | 45 × 1.20095 = 54.04 mpg UK |
| 50 mpg | 60.05 mpg uk | High-Efficiency Dedicated Hybrid Benchmark Sedan | 50 × 1.20095 = 60.05 mpg UK |
| 55 mpg | 66.05 mpg uk | Ultra-Aerodynamic Eco Hybrid Commuter Vehicle | 55 × 1.20095 = 66.05 mpg UK |
| 60 mpg | 72.06 mpg uk | Plug-in Hybrid Sustaining Mode Highway Economy | 60 × 1.20095 = 72.06 mpg UK |
| 70 mpg | 84.07 mpg uk | Lightweight European High-Mileage Prototype Car | 70 × 1.20095 = 84.07 mpg UK |
| 80 mpg | 96.08 mpg uk | Two-Stroke Commuter Scooter Urban Cycle Benchmark | 80 × 1.20095 = 96.08 mpg UK |
| 90 mpg | 108.09 mpg uk | High-Efficiency Four-Stroke Urban Motorbike | 90 × 1.20095 = 108.09 mpg UK |
| 100 mpg | 120.09 mpg uk | Ultra-Lightweight Eco-Marathon Mileage Vehicle | 100 × 1.20095 = 120.09 mpg UK |
Miles per Gallon (US) to Miles per Gallon (UK) Formula & Unit Definitions
One Imperial gallon equals 4.54609 liters while one US liquid gallon equals 3.785411784 liters. Dividing 4.54609 by 3.785411784 gives the exact mathematical ratio of 1.2009499255 (~1.20095). Therefore, multiplying US MPG by 1.20095 yields the equivalent UK Imperial MPG.
Quick Estimation: Quick mental shortcut: To convert US MPG to UK MPG in your head, simply add 20% to the US rating (or divide by 5 and add that value). For example, 30 mpg US + (30 ÷ 5) = 30 + 6 = 36 mpg UK (exact: 36.03 mpg UK).
Miles per Gallon (US) — mpg US
US EPA Standard- Baseline liquid gallon defined as exactly 231 cubic inches (3.785411784 liters)
- Mandated by the US Environmental Protection Agency (EPA) for window sticker ratings
- Produces numerically lower mileage numbers due to smaller fuel volume baseline
Miles per Gallon (UK) — mpg UK
British Imperial Standard- Imperial gallon defined under British law as exactly 4.54609 liters (10 lbs water)
- Used across the United Kingdom for automotive journalism and consumer comparisons
- Produces numerically higher mileage numbers because each gallon holds 20.095% more fuel
Frequently Asked Questions
Q.Why is UK MPG higher than US MPG?
A British Imperial gallon is approximately 20% larger than a US gallon (4.546 liters vs 3.785 liters), so a car travels more miles per UK gallon.
Q.What is the reverse conversion from MPG (UK) to MPG (US)?
To convert back, use the MPG UK to MPG US Converter where 1 mpg UK equals approximately 0.832674 mpg US.
Q.How do I convert US MPG to UK MPG quickly in my head?
Add 20% to your US MPG value (e.g. 30 mpg US + 6 = 36 mpg UK).
Q.How many UK MPG is 30 US MPG?
30 US MPG equals approximately 36.03 Imperial UK MPG.
Q.What formula converts US MPG to UK MPG?
Multiply US MPG by 1.20095 (or divide by 0.832674): MPG (UK) = MPG (US) × 1.20095.