I dont want to argue but that screenshot you have is actually a typo..... The 2.2 across years is the one that uses 87. ALL 2.4 across the years "recommend" 91 or higher octane. I

Read the online version. Page 5-5 just like your screenshot.
https://www.chevrolet.com/content/da...hhr_owners.pdf

Also states the same thing in my owners manual for my 2006, albeit different vin numbers and no mention of E-85

 

I absolutely don't consider this an argument, and for those that don't understand why we need certain fuels, a very good point to bring forward. That was an actual scan of my 2009 manual also and not a screen shot,, but thats just GM, can't always go by what you read,,,,

Exactly why I mentioned that "if the manual is wrong" common sense told me a 2.2L base engine should not have the needs of a "2.4L High Output Engine" does! This is something I have come quite familiar with from GM! One reason I am glad I have always taken care of my own vehicles and one reason I rely on experience over what we read!

I will assure if 87 octane is used and you are not having spark knock, you are not doing any damage to your engine, and why if you read farther down it says you can also use 87 octane as long as you don't notice spark nock, and that you may experience sluggish acceleration,,, I assure you with the gasoline I run this not a problem! I can also prove to you, quality top tier fresh 87 octane with proper additives for the region you are using it in is better than cheap 91 octane with minimum federal additives!

 

Very true! I have used 93 since I got Gregg, and only fill at Shell or Chevron. No sluggish acceleration here!

 

Bob109......

You need to rethink your thought process....... Marathon and Sunoco ARE NOT top tier brands,

Licensed Brands | Top Tier Gas

 

Use Shell or Chevron! I dont feel Mobil is quite as good. Same goes for there oil XD PERSONAL opinion.

 

My 2007 2.4 runs nothing but 93 octane... That's what it's tuned for. (Trifecta Tuned)

 

Not much to think about,, I'm not the one seeing a difference in 87 and 91 in my vehicle,,,,

If I was going to run a hotter tune I would too.. Plus, what this was all about,, If I owned a vehicle that had a label saying use 91 octane or higher I would, but I would have it checked by GM to see how it was tuned if I didn't know,, then by a reputable programmer or have a reputable tuner to tune it like I wanted,, but I would dam sure find out what I was driving!! That was the just!