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PostPosted: Sun Oct 16, 2005 6:25 pm 
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Joined: Tue Oct 11, 2005 10:13 pm
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Location: Chicago
1st Question. What performance boost will I get with Higher octane fuel. I am using regular. Does premium (93) Octane give any benifits?

2nd Question. Does those fuel additivs that you see in the auto parts store really give you better performace? If so which works and is recomended.

I have a 97 Geo Metro 1.0l 3 cyl.


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PostPosted: Sun Oct 16, 2005 7:15 pm 
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Higher octane is only useful if you advance your timing (or increase boost if turbocharged) to take advantage of it. Advancing your timing will improve both power and economy, but you'll be paying more for fuel.

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PostPosted: Sun Oct 16, 2005 7:32 pm 
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what should I advance the timeing to? Is there any damage that could occure if I do that?


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PostPosted: Sun Oct 16, 2005 8:37 pm 
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If you advance your timing far enough that your engine knocks, you will eventually damage your engine. Just back the timing off until the knocking goes away. In your case, using 93 octane may let you completely advance the timing. I'm running 94 octane with fully advanced timing, and I'm not getting any knocking.

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PostPosted: Mon Oct 17, 2005 10:37 pm 
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Joined: Thu Oct 28, 2004 8:52 pm
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Interesting questions for the fuel economy forum. High octane fuel and fuel additives add tons of power, if combine with a third item -- A Turbocharged Car!

But for those who are interested in high mpg, no, higher octane doesn't give better power or mpg on most non-turbo cars. Even if your car does knock, just back off your timing until the knocking stops.

If you are a bit anal about your car, buy the lowest octane fuel from the newest Chevron around (clean underground tanks/techron). Most metro owners have metros to keep fuel costs low.

Fuel additives work great, for the owner of the fuel additive company.


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PostPosted: Tue Oct 18, 2005 2:02 pm 
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Ive found using 98ron fuel gives me 30miles more to a tank then regular 95ron, and the car also feels more responsive

Prab

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PostPosted: Wed Oct 19, 2005 12:18 pm 
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Joined: Sat Sep 03, 2005 1:51 pm
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Location: Jacksonville, Fl
swiftcirrus wrote:
Ive found using 98ron fuel gives me 30miles more to a tank then regular 95ron, and the car also feels more responsive

Prab

yha but that's in an english car with higher comp, and with better gas available.
My friend at fccj, ran 24psi on a eclipse w/ stock internals, on pump gas 87oct, with no det
the higher levels are just for protection against det/knocking in high comp, high rmp, high advance, high heat, and/or high boost
what you feel is a more acurate ignition making your accel feal smother and faster.

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PostPosted: Wed Oct 19, 2005 8:42 pm 
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i think the brand of gas has a tremendous effect on mpg. I have used citgo 87 octane and get 39-40 mpg. when I swithched to Schell 87 octane my mpg increased to 43 mpg. So shop around to see which brand will give the best mpg.

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