[Shop-talk] Fuel Octanes

[mg_garage at comcast.net]

My 2003 Audi A6 wagon calls for premium fuel.  I have used 89 octane in the past and have noticed a more difficult start and a little less performance.  It just doesn’t seem to run as well without premium (93).  Gas mileage is lousy with either, about 18mpg combined.  The cost of maintenance/repairs and insurance in addition to the use of premium fuel and poor gas mileage makes the car hardly worth driving these days and it mostly just sits. 
Oddly enough, I worked for a Mercedes dealer in 2007 and 2008 and we always recommended (as the manual does) premium fuel.

Hth
gordie



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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