I've been using Costco gasoline for my vehicles for the past 5 years or so (~ 90% of the time) and have NEVER had any issues with it. I put it in the Z, my Jeep, wife's Sonata and my motorcycle and as far as I can tell, it is of good quality. I've used Sam's in the past as well without any issues either...
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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