You don't get as much water (if any) sitting in a Diesel exhaust either.... plus the oil coating. I don't know if Diesel just doesn't create as much water in combustion or if the exhaust gasses are just hot enough that it doesn't condense on the way out. You don't see a Diesel steaming or dripping water before it warms up on a cold morning like you do a gasser.... maybe smoking a little. I would bet that it doesn't create as much water though.

__________________
1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k