While I wouldn't be surprised to see the HCHII leap-frog over the Prius this summer, we will would need to get through the winter to be 'ahead'. I say that because we are still having a good increase in the number of HCHII's being added to the database (during the warmer months). For them - there is no winter data yet!

My personal experience is that my HCHII is up from about a 42 mpg winter average to about a 47 'spring' average so far. I guess time will tell how much it really keeps going up - but just yesterday I got a 56 combined highway drive that was typically a 42-46 mpg drive in the winter!

Eric