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I am confused and frustrated with my 2007 Honda accord. I owned and drove a 2003 Accord for 70,000 miles then traded it for the 2007.  2003 was the first year for the redesigned V6 with the 5 speed auto and electronic throttle control. The engine transmission synchronization was exceptional, always in the right gear, no gear or torque converter hunting and near impossible to detect gear changes. This car averaged 30 mi/gal at all times for the type of driving I do.
The 2007 has the same engine and transmission as the 2003. (Who knows about the electronics?) The 2007 engine transmission performance is acceptable if one did not expect better. It seems to shift prematurely, the torque converter locks and unlocks frequently, and I am aware every time it shifts gears. The 2007 gets 25 mi/gal on the same roads and the same driver as the 2003. I now have 30,000 mi on the 2007.
I have talked to Honda about this with no explanation of why these two cars with the same drive train and the same driver on the same roads perform so much different. Does any one have an explanation?  

hmm... great question....     perhaps it is do to the newer model needing to pass even tighter emission standards.. so a bit more fuel is burned to heat the cats to burn off the emissions...

perhaps... it is time to get a scan tool... and clear the long term memory... and the first time you drive it..   drive it like there was an egg under the gas pedal...  so the ecm learns a different program...  it should relearn and adapt as you drive.. but i am not into the latest honda programming..    is there an old fashioned switch somewhere that changes the performance of the cars programing.. from normal to economy to sport??????

perhaps.. other people complained about the lack of feel when driving the car.. as each model has a bit of tuning experience from prior models and from feed back from customers..    smooth shifting may also shorten the life of the clutches in the transmission...    a little too much slippage between shifts ...    a good friend of mine just topped 240,000 in his 2000 accord with the 4 cylinder motor..  the trans lasted till 220K..

i know that this did not give you a direct answer.. but i thought you deserved as much as i could come up with...