I really wanted a renazco, but ended up for a seatconepts. I will say for the price difference, I think I made a good decision. I think it may be possible for the renazco to be a finer seat, but for double the cost, and 20-30 times the wait.....
Maybe someday I'll order up a renazco to test it out, but for my trip I just ran out of time and money.
I'm a bit interested in your IMS 4.6 getting you only 100m per tank. I know I generally get 130+ miles and never even hit reserve.
I am adding the Acerbis tank to my bike for my planned TAT trip this summer. I've had a few battles fitting it, but after a lot of cursing I went in and reroute all of my wiring and cabling, and as of last night, its fitting pretty smoothly. The factory mounts suck for Acerbis, so pick up one of Hodakas mounts.