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Old 07-31-2009, 07:32 AM   #11
scrming
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Quote:
Originally Posted by SSOOCH View Post
What I don't get is the owners manual for my HHR SS states to only use 91 octane or higher on it's 2.0L Eco-Tec. So why do they not require it in the 3.6L, 44 more horse power V6 that's in the LT Camaro? Is it because the HHR SS is turbo?

I use 91 in the HHR SS & my SS/RS Camaro!
Lot more to it than just HP... Don't know anything about the 2.0L... but you have to look at things like compression ratio, timing, A/F and now direct injection...
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