[wimorrison]

There was a regular poster here, apologies I can't recall whom, but he did a few brim to brim comparisons over long distances on the same routes several times and he came to the objective conclusion that the benefit of the premium fuel was almost to small to measure but that the cost in the wallet was easily measurable.

I wish I could recall the exact detail as it was the only objective comparison that I have seen.

To my mind the belief in the advantages and consumption of these premium fuels only demonstrates the power of marketing.