Honestly....depends on the quality/material of the clutch and the driver. I've seen people burn through a clutch in 30k. Offroading often would require minor clutch riding (if not in 4LO) which can shorten its life. However, mostly, it's simply due to the fact that dealers have 1001 excuses to blame you if something goes wrong with the transmission (mis-shifts, clutch riding, foot on clutch while driving, dirt, water ingestion, etc) and as we said earlier, the JK manual has a few known issues that would suck if you got the teraflex style "it's your fault" excuse. I am not saying don't get the manual, he said he wants to save money and get manual, which is why I said that it doesn't actually save all that much, not to mention the potential dealer headaches. Furthermore, the Mercedes developed A580 auto in the JK is an incredibly strong transmission (way overkill for a JK) and has proven to be dead reliable since the days of the bug eyed E55 Benz. Again, just my .02