I agree that VP MS109 is the best pure gasoline fuel out there. But at $74 for 5 gallon drum, water injection is more economical and will provide the same results if not better especially in hot weather.I run 91 octane for commuting and VP100 at the pump for hot hatch driving. I have tunes for both stage 1 and stage 2. Car runs 100% better on VP100 or a mix of 25% VP U4.4 and 91 octane. ACG Motorsports in SD specializes in VP MS109 tuning and all their shop cars run it and can really put a spring a cars' steps. Tuners for pump gas take into account the 10% ethanol in pur crappy gas.
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I've run Arco, not all gas is equal but getting power out of 91 is an exercise in futility.For anyone wondering, I would put Costco gas in a "below top-tier" quality (former employee, and it used to be Sinclair fuel with a "modified detergents package" if I remember correctly). Stay away from Arco and similar brands. Been tuned for quite a long time and even at $.10/gal delta, it's about a dollar extra to put good gas in and that makes it easy to justify IMHO.