All we have here is regular, so that's what I'm using. I just tried a local BP for Amoco premium and they were out, only regular. Guess I need to get some of the octane booster tomorrow. My bike did cough once on the regular.

 

His 06 CVO has the SERT and tru duals, so it is not stock.

 

My 2000 RG has a recent HD reman. on the stock diplacement eng. with the stock CV carb. and is used for quite a bit of commuting (400 miles + a week) and seems to run much rougher on 87 oct. even with 4 oz. of 104+ per tank. I recently found a station with premium and filled up adding 4-5 oz. of 104+ and experienced a much smoother running eng. after just a few miles back on the road.

 

Could it be that some of the bikes out there are running poorly on permium fuel because the premium sits longer in its storage tank? With today's fuel prices, I am sure there is very little demand for high test gas. There were many posts that indicated even Mercedes drivers are passing on the high test even though it is recommended by the manual. The shelf-life of ethanol-based fuel today is much shorter than days gone by, so it only stands to reason that a bike wouldn't run well on degraded fuel.

My fuel injected Heritage runs well on regular gas.