I use the full synthetic Amsoil in my motorcycle too. It did burn more oil then normal until the first oil change, now it burns less. I started running it when the bike was 25 years and 15,000 or so miles old. I don't run it in my trikes, for the number of times I change my oil it would not be cost effective. For the trikes I change it based on how dirty it gets with a minimum of 1 change per year, For the 200 miles (on a good year) that I ride each machine I don't think there would be much difference between conventional oil and synthetic. Now putting thousands of miles on the bike each year has me only using the synthetic in that engine.
I’m no expert though.
1984 Yamaha YT 60 Tri Zinger(current project)
1983 Yamaha YTM 200 (rear suspension kit)..... long term project
2004 BMW R1150R
1972 Honda CT 70
2007 Lifan 110