I have had a '04 and now a '07. The power difference can certainly be felt. As far as mileage, I don't think you will ever see a bit of difference.
The '06+ are available without AHC, you just need to look a bit more.
The '06+ are available without AHC, you just need to look a bit more.
, can't really go wrong with any year when it comes down to it.