I finally got tired of running the engine to use the on-board air compressor to fill my tires.
I found this compressor at Sears:
http://www.sears.com/shc/s/p_10153_1...&blockType=G12
It does actually produce 150 PSI and is light, easy to use, and stores in a driver's side bay. Filling the front tires to 120PSI was a breeze.
Currently on sale at Sears for $89.