Took a trip to St. George Island FL from Atl last week. Loaded truck, three full sized folks. Had a new tank, usually get 43-44 mpg not trying too hard but keeping the speed on the hi-way down to the 60-62 range (the point at which I see the mileage start to drop at hi-way speeds). I was anxious to get there and put it on 78-82 mpg on 2 lane and 4 lane roads mostly, NO traffic at all, A/C most of the time. The mpg's just kept dropping until the finally figure was around 36.5. Got simular results on the way back under simular conditions. Back in Atl now, new tank, mpg back to the 43-44 range. (12k total miles on '05 HCH). Clearly not made for "get me there quick" w/o the trade of mpg. Not unexpected but thought others new to the car might like to hear of the experience.

PS: saw another HCH the moment I hit the Island......BTW Oct on the Gulf works out very well...........

Pete