I went on a day trip in the canyons in Malibu this past weekend with a bunch of guys here in So Cal. and several said they had bad luck using Shell Gasoline. I read several old threads and most people said they use 93 octane. Well here in the land of the fruits and nuts we only have 91 octane as the super unleaded. I use Shell in my van and it works great. Anyone have trouble with Shell "V" power 91 octane in their HD?