Mine is an 08 standard with 85000klms on it. I got it with 9000klms on the clock. Ethanol blend petrol must have the % displayed at the pump. I don't think it was very popular and not many have it now. It was never compulsory to use and the max they can add is 10%
I drive a diesel so I don't buy petrol very much and tend to buy it at the same garage when I do.
I'm not sure if mine does have piece of gauze over it, Im just going off the words of a bike mechanic, he does a lot of work on other Triumphs like street triples etc.
I suspect the packing inside my jards is too loose and exhaust is getting past the baffle and making it sound rough. I seem to remember having this problem years ago and repacking them made huge difference. I have them out now and just having a coffee break waiting for the shop to open.