I've followed the posts on this thread and thought several times about replying...but never did until now.

My 2016 F6B can move right out as soon as I start it. I always let it run about 30-60 seconds just to let oil get circulated and I take it easy on the throttle until it gets warmed up. Never have had a stumble. I wonder if it could be that here at 8,500 feet it runs just a little richer because of the thin air and that this helps. I know the ECM makes the adjustment for the altitude, but still could be a little richer than for those at lower elevations.

As for octane, at this elevation regular gas is 85 octane (same anti-ping result as 87 at lower elevations) and that's what I have run for 14k miles, except on a couple of trips that were a little lower in elevation and the regular gas was 87 octane. Have never had pinging on my F6B, even when rolling hard on the throttle.

My 2002 GL1800 Wing performed the same way until I was running back east at lower elevations and HOTTER temperatures -- crank it hard and I would get pinging with 87 octane so I used middle-grade in those cases.