Never really figured that one out Barry - why US galls are different to the old imperial measure, I've no idea. Aside from the gentle piss-taking, it is becoming a worry here too. The entire economy revolves around gasoline and $3 per gallon is a certainty within the next week or so in FL (It varies significantly state to state). All kinds of hilarious excuses - the latest being increased price for 'summer-blend' fuel.
I'm planning a road-trip to AZ soon and my 'Burban does an impressive 15mpg - so not much change out of $600 for petrol there and back - that blows.