hawk20
MB Enthusiast
I'm not sure how they measure MPG with a hybrid. Starting with the battery fully charged, a hybrid could potentially do the urban cycle on electric power alone = infinite MPG. That would be false, because that power would have to be replenished by the engine (consuming fuel to do so) afterwards. I.e. the fuel consumption is 'delayed'.
As the only real advantage of a hybrid is recovering and re-using braking energy, IMO they should start the cycle with the battery fully discharged.
Good point. That's always worried me too and may well account for why so few Prius owners ever get the claimed mpg or Lexus hybrids.