Over time my millage went down to 10-12 took it to the dealer and they found that 2 exhaust man bolts had broke on the pass side and was making it read lean. They replaced and now I am back up to 13-15 with mix hiway/city

 

I get 11-12 in the city but I drive it hard and pull away from every light. Mostly because I have an exhaust and love to hear it sing. Oh yeah and I'm running 285/65 18 Nittos. A little bigger then stock so I'm sure that affects it.

On the flip side I've seen upwards of 27-28 on the freeway with the stock tires on.