From my experience it makes more of a difference with things like motorcycles... in fact there's a swelling/cracking tank issue caused by ethanol.  I haven't heard of modern cars being too effected though.
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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