My car gets 12 rods to the hogshead and that's how I like it!
 

How to do international?

Obviously, we should try and be more than america-centric here on the world wide web, but how do canadians buy gas? I could have sworn the last time I was driving in Vancouver gas was sold by the gallon, but is it km/L around the world?

I think up there it's called petrol and they sell it in bags.

Looks like liters/100km is the european standard.

Unleaded, diesel and LPG (liquid petroleum gas) is sold by the litre here in the UK (where we're kicking around $11-12/gal here!), but we still measure road distance in miles, and consumption in miles per gallon.

L/100km is the Canadian standard as well.

Only back to 1999 is available online, but possibly of interest: Canadian fuel consumption guides.