Just a little more data, my build date is 4/26, I have pretty consistantly got between 17. 5 to 18. 5 non towing, and around 14 pulling 2 horse tag (about 7500# loaded). Have 4500 miles on the clock, and just recently noticed the white smoke on startup. Doesn't happen all the time, and no where near like what I would get on the old '92. So it would appear that I have a "decent" 600 from a mileage standpoint. Unless I hear about guys like me picking up mileage after getting this flash (when released), I'll probably pass.
Bert, that's some pretty good numbers. You must have got a PERFECT unit.
Pat