I'm not sure where to put this subject so I will start here and it can be moved if needed. I have a 2007 Heritage Classic that I got a month ago. I just figured out a pattern. When I get to (approximately) the red zone on my fuel gauge, which is maybe a gallon remaining, my bike dies when I'm standing still or coming to a stop. I thought maybe I had some bad gas and filled up with the highest octane and it runs perfect. This has happened twice. Any ideas what the problem is? What grade gas does everyone use?