When you see our American friends quoting their gas mileage, don't forget that a US gallon is smaller than an Imperial gallon.

1 US gallon = 0.83267384 Imperial gallons

So, if my maths (or math if you are American!) is right, as an example...

27 miles per US gallon = 32.4256614 miles per Imperial gallon

Sure beats that Mazda RX-8!!!