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.
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