Quote Originally Posted by CH@Dbee View Post
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
it depends on the setup and motor, some engines are detuned from the factory and if you do some mods and run premium it will do ok. example my brothers 89 GT with 64k miles on it gets massive power gans from simple bolt ons because it was detuned so much from the factory. really do your research from a crdible source before trying it, i kow after aall my bro has done to the car he still runs 87 not 93 like me.