Join Date: Jan 2019
Location: Eagle Lake, FL
Year/Make/Model: 2008 en500c
Unless I misread your post, you've fueled up at more than one location, and the problem still hasn't gone away?
I'd be looking at that front cylinder's injector and spark systems.
Only two things I know of that could cause the symptoms you are describing that results from "bad" fuel... Water in the fuel or the wrong fuel in the station's tanks (partially diesel or a similar issue). Both are very rare. But... those are both eliminated by the fact that one cylinder runs fine and one doesn't. If it was truly fuel related, it would affect both cylinders, generally at the same time (probable shutoff type situation). One cylinder cutting out will cause the bike to run rough and drink more fuel than you think.
Possible causes to investigate: Electrical connections (including spark plug wire at both ends), partially clogged injector, coil (weak spark), spark plugs (fouling). This isn't a complete list, but it's a good place to start.
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