I can tell the difference on the hwy without mine attached(although my 89 very rarely does much Hwy travel), I leave mine on except when doing extreme trails. I have about a 6" SOA lift, I also use the sway bars on the road most of the time. They all get disconnected for Rock Crawlin,it only take a few minutes.
Jeff
89 Wrangler
Jeff
89 Wrangler