Sounds more like they're pulling a Ford to be honest... I can count on one hand how many decent parts counter guys I know, and that's pretty damn sad...
Also remember that they're using additives so that 10% they're using to raise the octane rating doesn't eat your fuel system.
Personally, I wouldn't, the risk of going lean and causing damage far outweighs a little saving at the pump...
EDIT: you also have a thread on your engine making...
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