Right now, Encke Gap is about 0.085 arc seconds across, according to a quick measurement of an HST image I have. Damian Peach caught what I would call an impression of Encke Gap in his Saturn images repeatedly with a C9.25 in 2005 using a monochrome camera and RGB filters. view here:
http://www.damianpeach.com/sat_0405.htm
I think its possible, but only when seeing is really good. Also, probably only possible with a monochrome camera and filters because color cameras are bayer matrixed, i.e. lower true resolution. I have yet to get a capture that I could definately say shows the gap even with a monochrome camera and C11.
If I saw the same thing in all 3 color channels, I'd be more inclined to say it is Encke Gap, but its different in each channel. What I see in red channel is definately an artifact.
Still, its a very good shot Dan.