I have a 2010 Limited with 4500 miles and now get 38 to 40. When new it got 40 to 42. When I carried it in for 1000 mile service, they changed all oils to synthetic and I did complain about the heat and lugging way to easily. When they finished it ran like it should. Don't know if they made changes to the electronics or not. I am assuming that is where the 2 to 3 mpg went, but no more excess heat and 6th is smooth down to 50 to 55. Before it would only do down to 65 before it started bucking. The power down low is much better. No more clattering when I take off a little slow. The single cylinder running would activate at nearly every stop before. Now it seldom ever come on.