Yeah, it's always been annoying figuring out my fuel costs whenever I go to Canada. I can do most length measurements in my head (cm, mm, m <--> inches, feet; km <--> miles) but volume measurements are more annoying. To be fair, I still have to think a bit even when going from, for instance, tablespoons to gallons, so volumes aren't my forte anyway. Though having dealt with a pool this year has forced me to practice that bit.
"Yes, Gideon, you could empty the pool with a spoon, but it'll take you 1.5 million spoonfulls..."