I always run the highest octane available. If you figure what it cost you to fill up with the cheap stuff or fill up with the good stuff. The price is difference is nominal. .20 X 6 gal. = $1.20 So for the difference, I fill up with high octane.
I have always heard that if you have a high dollar ride, isn't it worth the high dollar fuel?
Big T
Oh by the way, did the dealer happen to mention mention how bad the valves were out of adjustment? And I hate to ask but how much did it set you back?