6 litres/100 km or less (that is 36 mpg or more)

If we're talking about U.S. miles per U.S. gallon, 6 liters/100km is equal to 39.25 mpg.

You are right - I failed to use my own formula properly.

Crikey, dont tell me you have different miles as well! So thats pints, gallons, pounds, miles, ounces[?], any more different I should learn?

We have differing standards of truth and honesty, too. Just watch Fox news and listen to Rush Limbaugh!

Miles are the same; gallons are different. A calculator/converter for US/UK mpg and litres/100km is included on the last line on this page. (enter a number in any box then hit tab/enter).