Trigger Wheel on an Interstate

[SS Twin]

I'm in a search for the "right" Interstate and think I've found her.  Just the right color, great options and looks fantastic.  One question for the "gurus" to help out this newbie.

The owner says that it has a 6 degree trigger wheel with stock pipes and I presume stock needles and jets. My learning so far says that an Interstate needs a 4, not a 6 as that would be 8 degrees total which is the range that detonation could occur.  The owner says that he runs premium and it runs great.  Don't know how long he's been running it, but the bike has 42K miles on it now.

Should I be concerned about this and how can I determine that there has been no harm done. I'd be traveling over 1200 miles to pick her up and ride her home; so I don't need any issues (or worse)to crop up.

Thanks to all for any advice or guidance you can give!

Steve

[Thunderbolt]

a Tourer or Standard and the 4 degree is for the Interstate.  I ran the 6 in my Tourer and used 89 gasoline.  If the owner says it works fine, I suppose he should know, you could always get a 4 and install it.  My Interstate seems to run just fine with the OEM wheel.  I do have the pilots out to 2 1/4 up from 1 3/4.

[sandy]

There shouldn't be any harm done, but he's probably losing HP at the top end. If you bring it home, get a stock T wheel and put it in. Maybe he still has the stock T wheel.

[Ricky-D]

I run a 6 degree wheel in my I/S and burn premium gasoline, always have.  No problems at all!  I don't normally ride at 100mph or above so any top end loss is irrelevant to me.

***

[Shockbushing Gary]

I put a 6* wheel in my I/S that has been there since 2001. I ran Premium for a while, then decided to experiment. Ran mid-grade, then regular. No difference, so it got regular since 2002.
It hasn't been hurt yet.
Draw your own conclusions.

[asfltdncr]

I've had a six degree in my I/S and run regular gas without problems for 40k miles now.
Don't take it out-there's a reason why the aftermarket trigger wheels exists.
The throttle is much more responsive.

[SS Twin]

Thanks to all for the good advice and real world experience.  I appreciate it!