I usually get premium. I do get better mileage when I do. However when I get regular, or mid-grade the bike runs well on those as well.
I noticed something the last time I went to Utah. The octane levels of regular, mid, and premium are lower there than here. In Utah regular is 85, mid is 87 and prem was 91. Here regular is 87, mid is 89 and prem is 93. So getting regular here is like mid-grade in Utah.
Soren
