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Old 03-30-2009, 10:33 PM   #1
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Regular vs Premium

It's been said the SS V-8's will run fine on regular. What performance decrease will there be when using regular vs premium and if used regularly will regular harm the engine. Does anybody know?
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Old 03-30-2009, 10:35 PM   #2
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The only time you'd need to run premium is if you change the tune to a 93 octane b/c of an induction change. If you're running the factory tune then paying for the more expensive gas is a waste. Essentially, regular gas will do fine.
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Old 03-30-2009, 10:39 PM   #3
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the thing with reg. unlead is that the octane rating has to be atleast 87 but it can be as high as 93. and often is. i ran regular in several cars i have had that called for premium
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Old 03-30-2009, 10:40 PM   #4
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This was asked in a previous thread.

But! The cost difference really is not that big... at most 25 cents more a gallon. Let's asume a 18 gallon tank, (just a guess, my FJ is 16.# something) $4.50 a tank.

Unless you fill up every other day, it's worth the extra expense. If you're getting a SS I would get the higher octane.
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Old 03-30-2009, 10:42 PM   #5
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Higher octane = higher burn = more HP
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Old 03-30-2009, 10:47 PM   #6
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Quote:
Originally Posted by kopacko View Post
Higher octane = higher burn = more HP
pardon????

The function of a higher octane gasoline is to delay the flame propogation or 'burn' to prevent detonation. I'm not sure about the L99, but the LS3 will have a 92+ octane recommendation.....just like the corvette. Sure, there will be no problem running a lower octane gas......any detonation, or ping will be picked up by the knock sensors and the computer will dial back the ignition timing....but you will definitely not get all of those 420+ horses!!

So, performance affected with regular gas, definitely, engine longevity affected with regular gas, definitely not......
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Old 03-30-2009, 10:48 PM   #7
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The only time you'd need to run premium is if you change the tune to a 93 octane b/c of an induction change. If you're running the factory tune then paying for the more expensive gas is a waste. Essentially, regular gas will do fine.
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Old 03-30-2009, 10:54 PM   #8
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Originally Posted by kopacko View Post
Higher octane = higher burn = more HP
WTF? Research. Higher octane = slower burn
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Old 03-30-2009, 10:58 PM   #9
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Sorry, meant higher energy to burn...not higher burn too fast for my own typing.
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Old 03-30-2009, 11:03 PM   #10
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Sorry, meant higher energy to burn...not higher burn too fast for my own typing.
Sorry for the flame. This has been talked about here at great length, some with knowledge and some without. Search, you will find. Some are even funny.
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Old 03-30-2009, 11:05 PM   #11
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Yea eventually might need a 5th gen specific Octane guide. Basically use unleaded in the V6 and Super in the SS.
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Old 03-30-2009, 11:10 PM   #12
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why not use reg and a bottle of octane boost? I run 87 in my Trailblazer SS it calls for premium but runs fine on the 87. I can definately tell a difference if I run the 93 in performance (and maybe mileage) but I can't tell for sure because my wife drives it too and she always seems to burn gas faster than I do and she says I drive fast...lol
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Old 03-30-2009, 11:28 PM   #13
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You ever notice the scam at the pumps were the 93 is like 60 cents a gallon more then the regular because they know most people look at the lowest price on the sign (also always on the top of the sign) as they pull in. You know it's a scam because then you see the guy down the block foe 12 cents more, but everyone starts the regular price very close to each other!
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Old 03-30-2009, 11:31 PM   #14
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In the LS1 running lower octane is fine for the engine but the computer retards the timing, so you lose power. No engine damage though. I just can't bring myself to save $3.00 per tank when I know it will cost me performance. I usually drive pretty calm but I do get on it at least a few times per tank.
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