When I started riding my P150 this spring, I installed an NGK iridium plug and started using synthetic oil for the first time. I was hoping to see a little increase in fuel economy, but the opposite has occurred. Last year, I was typically running in the low 70's for mpg, but this summer I was usually in the high 60's. Not sure if I was a little more twisty with the throttle this summer or not. Scoot still ran great but next spring I think I will stick with the synthetic oil and go back to the conventional plug and see what happens.
