Thanks, that would be interesting to know

 

'15 MCS w/JCW pro tuning kit. In Sport mode with baffle open I drove 265 miles and averaged 68mph. Gas mileage was 33.5mpg.
In ten days I'll be heading back and will run in green mode as much as possible. I'll post results at that time.

 

Thanks, that is what the sticker states, I assume the city is probably were it suffers the most then. The local dealership had a demo with the tune and exhaust on it, I got to drive it today it was a manual so hard to compare exactly to the automatic I drove 10 mins earlier, but I liked the sound of the exhaust open, and it does pull pretty good in comparison. Still interested on green mode numbers.

 

Mine is a manual also. I will hazard a guess and say the green mode might be ~2mpg better than sport. We shall see.

 

Came home a couple days early. As I said, on the return trip I spent 90% of the time in "Green" mode and the rest in "Mid" and with the baffle closed. I drove 258 miles and averaged 66.6mph. Gas mileage was 37.6mpg.

4.1mpg improvement, but not nearly as much fun. YMMV

 

Those numbers don't seem that far off of what people were getting without the tune.