Runs very well. I couldn't get my Garmin to initialize so all we had was the speedometer. I was reading 76-77 @5500-5600 rpms but we had 4 full-size adults and 3/4 tank of fuel. Funny thing, I got home and set the gps on the table on the deck and it auto-located in about 30 seconds. Hopefully we'll get a nice evening this week to plot the mph/rpm curve. T.B., do you have any props SuperV might be able to try?