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I'm not familiar with those brands, but gas is gas, unless it has extra detergents. and even then it's still just gas. There are way too many variables at play to attribute better mileage to the brand of gas you happen to be running.
In fact, I sometimes run 87 octane fuel from Arco in my TSX, and sometimes I run 92 octane from Costco (Top Tier), and I can find no pattern of one having better fuel economy over the other. My car is even tuned to run best on 91 octane, so you would at least expect it to get better fuel economy on premium.
Stale gas isn't an issue unless it's sitting for months, and then the biggest concern is water absorption.
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