[Shop-talk] Fuel Octanes

[Brian Kemp]

My understanding is that the computer will compensate for 87 octane, but 
the car won't run as well.  If you are towing, I would definitely use 
the 91 octane.

On 5/7/2017 10:23 AM, eric at megageek.com wrote:
> At the risk of starting a thread to rival the 'synthetic vs. conventional oil' debate, I have a question.
>
> I always had trucks. I'm not a performance or luxury guy, so my fuel of choice was always go ole 87 octane.
>
> Two weeks ago, I got an amazing deal on a 2007 MB GL450 just has my GMC was getting ready to 'move on.'
>
> So, as all good geeks, I read the owners manual (not cover to cover yet, War and Peace was shorter.) But in there, they state I should only use 91 or higher octane.
>
> Well, I don't necessarily mind pay about $10 more a fill up, but it got me wondering.
>
> Does anyone know if this is REALLY necessary? Would 89 Octane do as well? What if I filled up the tank every time it hit a half tank and alternated between 89 and 93? (to average about 91)
>
> What if I just ran 87? Is it possible engine damage, or just reduced fuel economy?
>
> I started searching this on the web and I found out that the consensus is unanimous... Half agree, half dis-agree. 8>)
>
> Anyway, what does this think tank think of this tank issue? 8>)
>
>
> Sent from my Commodore 64 on a 2400 Baud Modem.
> Tech Viper
> "Be as beneficent as the sun or the sea, but if your rights as a rational being are trenched on, die on the first inch of your territory." Ralph Waldo Emerson
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