to be honest, i have no clue what the 4.3L VORTEC chevy motor calls for but it DID make my dads truck run better. his MPG was alot better with 93 oct than 91 and faaaaaaaaaar better than what he got MPG with 87 oct.
i dont own a gas station so you guys do what you do but i did want to share the information about what i know![]()





unless its tuned for it.


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