Okay, yes, I know it's an oil thread, but I didn't really intend to get in to the whole mineral vs. synthetic debate since the topic has been discussed millions of times. But in fairness it hasn't had a chance to be fully beaten to death on the new board.
... aaaaaand my mileage did increase, noticeably, without a change in riding habits or fuel source. It will take some time to quantify how much. Both the average MPG on the display increased and the calculated mileage increased on the last tank. And for you haters out there, the bright green color of the Motul 300V just looks SO COOL in the site window!