6 octane

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Old 05-04-09, 02:04 PM
nightowlpunk's Avatar
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6 octane

How can 6 octane make a night and day difference in my car? My 95 VW Jetta III has a sticker inside the gas door saying high test recomended. It runs decently on 87 octane, but is a totally different animal on 93 octane. For some reason, it is not very happy unless I give it Mobil gas, not sure why.
 
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Old 05-04-09, 02:11 PM
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Cause thats the way the engine management computer is programmed. It has to retard the spark and all to avoid detonation when using the lower octane gas. One reason I didn't buy a VW, though I really liked the car.

I know its funny, but I've read reports where you may actually get enough better milage using hi-test to offset the addl cost. Seems like that was only when it was mostly hiway driving though.
 
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Old 05-04-09, 04:05 PM
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about the same for me due to the fact my right foot is gaining weight around 22mpg with 219k and auto trans
 
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