Just returned from a 2 week trip from Minnesota to Oregon Coast and wanderings in between 5057 miles total. Burned 111.5 galons of 85-87 octane fuel averaged 45.4 mpg. Adjusted my float and went back to stock jet before my trip. Prior to working on the carb I was getting low 30's for mileage so it was worth the effort, thanks to advice from Musky. I did some testing on the way back, filled up with premium gas in Buffalo Wyoming and kept up with traffic 80 mph and mileage went to 34.0 Filled with regular gas and ran again at 80 and mpg went to 33.2 so not much difference. My best mileage consistantly was in the mountains. Some days I crossed a couple of passes in Montana that were 7200 ft and my mileage was in the low 60's. For the most part in the mountains I received 52 mpg and in the flatland I was at 42 mpg. Why the big difference?
It was a great trip and only had to stop and tighten a couple of bolts holding my exhause pipes.