i have a TE, but i don't think that should make a big difference.
is there a way for the ECU to relearn driving habits, and lean out the air fuel mixture?
Here are the things I think that helped out;
Tail Wind
Air Conditioning off
Windows closed
Tires at 44lbs (thanks Mike)
CC at 58 mph
Cool ambient air
Pure gas (no ethanol)
I have a 2010 TE and I avg 21 city and up to 23/24 hwy. I live in VT which is pretty mountainous. One trip I did recently coming back from Bennington, VT to Burlington I was getting 32 until I hit Rutland, lot of traffic lights. I glad I waited to get the TE and not SR5, love this vehicle.