Quote Originally Posted by 89Vette View Post
Pretty darn close to stock. IIRC, the 5th gear is the same as 4th in the stock automatic. So, it stands to reason there won't be any difference on the hwy.
Yeah I've come to realize that there aren't serious MPG gains with the AR-5 in highway driving. But the fun-to-drive factor and (hopefully) better reliability still make it well worth it IMHO.