Has anyone else tried a K&N Aircharger Kit on their 05+ GT. I bought one on ebay for $150 a few months back. It gave a seat of the pants boost and made the engine sound meaner when you mash the gas, but unexpectedly I'm getting better gas milage. No change in around town driving; still max out at 18 mpg if I behave. On the road however, I've gone from 24 to 26 mpg (that's at 70-75mph, obviously you could do much better driving slower). The first time I noticed I thought maybe it was a good batch of gas, but I've verified it on three 100+ (one way) mile trips. Anyone else had this kind of luck.