I think it's worth it. I bought mine before the trans tuning was even announced and was very happy with it then, transmission tuning is a welcome bonus for me. A word of warning though: the 91 octane tune is addictive, I've been filling up with 93 since the beginning of summer. Every time I think I should be sensible and go back to the 87 tune or the mileage tune I find some excuse to stay on the performance tune, it's just so much more fun.

The Mileage XS tune is still better than stock IMO.

 

yeah i heard the 91 tune is actually better then XS mileage on fuel economy!? any truth on that?

 

Yea I got a little better mileage on the 91 tune, it was less than 1 mpg, however that is with premium fuel so it doesn't really save money. I only ran one tank through on the mileage saver though.