On my first X I got quite an education. I'd always run premium in my bikes. Got a brand new X, put premium in it and got lots of black gas smoke, detonation in the pipes and back thru the carb. Bike was back to the dealer 6 times in the first 200 miles. Seriously.
They'd drain the tank, tear the carb apart, trying to find the problem. Put in fresh fuel and it would run just fine. I'd leave the shop, stop and gas up and in a few miles the trouble would start again. And back to the dealer I'd go.
Finally got a Honda rep to come down to the dealer on the problem. The service manager, the Honda rep and myself sat and went thru the problem step by step. When we got to the part where I'd put Shell premium in the rep goes "you can't run premium in the 1300 VTX. Says that in the owners manual". The manager and I both holler "WRONG". I threw the owners manual on the counter and asked the Honda dude to show me that part.
He goes" Oh, its in the service manual." Service manager hollers "WRONG" and throws the sevice manual on the counter. Of course, the Honda rep can't find the BS he's spouting in the service manual, either.
The Honda rep then says "Maybe we need to post a service bulliten on this."