Shakey,
Good hearin from you. I took a 100 mile cruise after work last night. I used my heated clothing because after dark it gets a bit nippy. Anyway, you are right about the 19-tooth primary being a major contributor to my much improved gas mileage. However, I was getting better gas mileage before I installed the larger primary sprocket. It could be because of a whole roster of things I did. Like plugging off the AI hole, using full-synthetic oil (AMSOil), installing the nickel-platinum plugs, proper tire pressure, and, of course, riding/throttle habits. But, all of this came together shortly after I installed "the Freak."
Whatever it is, it's working.
Let me know when you all are going to meet again at the "Poodle Dog."
-BT