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My mechanic says that over the last 10 years, gas quality has gone way down hill, to the point where some gas is hard to light with a match. (I haven't tried that myself).
It's a good question, but I think you'd need a bunch of people to all sign on and fill at the assigned station, then after a month or so, switch the control and experimental groups. Otherwise, between weather and variation in the types of trips people run, there'd be too much statistical noise.
You'd also need to compute miles per dollar, seeing as how the cheap stuff is, well, cheaper, even if slightly lower quality.
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