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Some people around here have reported a noticeable difference in FE when going from lower to higher octane fuel. There were those for whom the MPG difference was larger than the price difference. There were also people who noticed absolutely no difference at all. Some of thoe were people with rather similar cars, even!
So you have to do your own testing to figure out how your car and your driving are affected by a different octane level.
BTW, I always thought it was amusing that when fuel was at $4+/gallon, people would balk at spending an extra $0.20-0.30 for super over regular, when they didn't have a problem with a $0.20 margin at $2/gallon.
-soD
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