I know the manual says that 91 octane is recommended but not required. My salesman said that for the Metris the dealership bought for errands around town, they planned to put in premium (93 octane) throughout the break in period and then switch to regular, checking during both periods to find out what the change in mileage with regular would be. I haven't needed to fill my tank yet (mainly waiting for a camper build that is scheduled to start in a week or two). So I was wondering what other Metris owners are doing. Care to share your experiences?