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Originally Posted by Jonster

I was under the impression that the higher octanes only make a difference if you are really driving the car hard. (and also helps lengthen engine lifespan)

edit: Obviously putting 91 in SS/ZL1 minimum and 87 in LS/LT minimum

There are also many other factors when fueling up like brand and region. There are some articles on Shell V-power vs BP ultimate, but gas is different based upon region as well.

(Not sure if this helps, just spitting out some knowledge)

At any driving......we see this while logging these cars for tuning. The amount of timing retart due to spark knock (detonation).

Originally Posted by Dave McFly

I don't get it how can my dad who has the same DI 3.6 V6 the Camaro has in his '12 Impala can run 87 but the Camaro has to have 93?

The owners manual for all, including the caddys and the buicks say 87, but that is for marketing only. You can run 87 just fine as the ECU/PCM pulls timing, but you wont ne running at optimine.

Originally Posted by Frank in MD

Not on a V6. V6 was designed to run regular unleaded gas. Premium on the 6'er is pointless.

Your talking with a few of us here that tune, build, mod, and build/rebuild these motors constantly....and are the leaders in product R&D and I can attest, any motor with 11:1 cr or above runs better, delivers more power, and better fuel economy on 921-93 than 87.

Originally Posted by turboguy327

The camaro required 87 minimum. It runs better on 93. Just like your dads car.

True and accurate.

Originally Posted by GretchenGotGrowl

Do you have some evidence that is counter to the evidence many of have seen on the dyno and street logging the timing?

Agree 100%. Not many have done as much as far as understanding these engines in every aspect, and gretch has the cashed checks & receipts to prove it.

Originally Posted by irocnroll

Placebo effect.

I dont think the dynos #'s , and the tuning logs fall under placebo...

Originally Posted by crateish

I run 87, but top off the tank with a little Everclear.

Nets me about 103 octane.






I am soooooo sirius.



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OK, Everclear is for your consumption, not the cars!!