Since this got bumped, I should add that my mileage results are pretty much ~2 mpg better than the stock tune. I'm getting ~400 miles per tank when I drive it easy and 300+ with an average amount of fun. I used to struggle to get 325 on a tank (I consistently fill up between 17-18 gallons every tank). I got nearly 250 miles on the tank of gas I took to the track (though it was only 6 laps at COTA).
75 extra miles should be a little over 3 mpg, so with some statistical variations I'm seeing 50+ miles per tank more than prior tune. I have to say this was unexpected, so I'm pretty pleased. The data I have was logged over the last 10 tanks (~4K miles).
Btw, I've got some vacation scheduled this month, and I'm hoping for dyno time in the following weeks after I return
