2007 Chrysler Town and Country Oil Consumption

My mini van has gone through 6 qts. Of oil in the last 3600 mi. But my problem is that I can't figure out where it's going. The engine runs fine, no spark plugs are fouled out, the exhaust pipe is a nice gray color, & there is no signs of a leak. I thought as a last resort maybe I had a blown head gasket & leaking into my coolent. Apparently not because my antifreeze is a nice yellow color & I don't seem to be gaining any. I've checked everything I know how to check & I'm still scratching my head. Any suggestions?