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It seems to vary from car to car, and possibly from driver to driver.
There is usually little if any MPG benefit from running higher-octane fuel. But in some cases, it does seem to make a difference.
In most of those cases, the cost difference per gallon is greater than the MPG difference, so it isn't worthwhile from a $$ standpoint. But there are a few people out there who have done what sounds like reasonably careful testing on their car and come to the conclusion that the MPG difference in their case was greater than the cost difference.
So far, I haven't seen any consistent pattern in circumstances that make it worthwhile. The only way to tell if it helps in your car is to try it and test very carefully.
-soD
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