Frequently Asked Questions
Why is US MPG different from UK MPG?
The US gallon (3.785 L) is smaller than the imperial UK gallon (4.546 L), so the same car gets a higher MPG figure on the UK scale. 30 US MPG equals about 36 UK MPG.
How do I convert MPG to L/100 km?
Use 235.215 / MPG (US) or 282.481 / MPG (UK). 30 US MPG works out to about 7.84 L/100 km.
Is a higher number always better?
For MPG and km/L higher is better (more distance per fuel). For L/100 km lower is better (less fuel per distance). That flip is why people get confused comparing US and EU specs.
Does fuel economy change with speed?
Yes. Most cars peak between 45 and 55 mph (72-88 km/h). Above that, aerodynamic drag rises with the square of speed and economy drops noticeably.
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