Originally Posted by **********

He dun goofed. Imperial gallons are different than US gallons. 1 US gallon = .83 Imperial gallons. 45 US MPG = 54 Imp MPG. Or, 65 Imp MPG = 54 US MPG.

Of course there could still be a difference anyway because the US has tougher emission standards, so maybe US catalytic converters constrict the exhaust more than their EU counterparts.

ps. Buy Tesla.