How can I achieve the right octane for my MS6? - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #1 of 16 (permalink) Old 04-09-2007, 03:42 AM Thread Starter
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so I found a station that pumps 101 in my area, but at 7.50 a gallon that seams a little ridiculous to be using every day.
what amount of 101 should I put in my tank to get a 93-95 octane mixture?
if I have 92 and 101 available, is the formula; 92+101/2 = 96.5?
I put 7 gallons of 101 in my tank and toped it off with 92. I noticed a huge difference. Im also going to get over 400 miles out of this tank... but was 7 gallons necessary?
in some of the other threads I searched there was mention of using toloune... what is that?
I also read that those octane boosters you can get at a store are garbage... is this true?

I would like to get some of these questions straightened out for us MS6 owners so maybe we can come to a best dollar per hp or most reliability for the money mixture firmed up...

I think there are two goals that most people have in mind;
1: how high of an octane level is useful to a mostly stock engine? (best mixture for power)
2: what is the cheapest mixture for gas economy? (higher MPG from more efficient fuel)


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post #2 of 16 (permalink) Old 04-09-2007, 05:41 AM
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For regular driving, just use 92 octane and not worry about it. If you really want to know the exact mixture to achieve 93 octane from 92 + 101, then you can use algebra. But still, I don't think it's worth it to be that picky.

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post #3 of 16 (permalink) Old 04-09-2007, 06:42 AM
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make sure its unleaded... im fairly certain that leaded fuel is detrimental to the o2 sensors..

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post #4 of 16 (permalink) Old 04-09-2007, 10:01 AM
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Where the heck is he going to get leaded fuel from? I dont think they really sell that anywhere in the us anywhere.
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post #5 of 16 (permalink) Old 04-09-2007, 10:09 AM
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Assuming a 16 gallon tank here is the lay out

Gal REG - Gal 101 - Resulting Octane - Cost of tank assuming $7.50 and $3.00 (that seems fair enough)
14 - 2 - 93.1 - $57
13 - 3 - 93.6 - $61.5
12 - 4 - 94.2 - $66
11 - 5 - 94.8 - $70.5
10 - 6 - 95.3 - $75
9 - 7 - 95.9 - $79.5
8 - 8 - 96.5 - $84

So it would seem to me that 2 gallons high test gets you what you want, if your going to the track maybe 4 gallons to be extra sure. Obviously if 92 is cheaper then your pocketbook benifits from using less high test, but that is the care regardless, i didnt know where you lived so i used 3 as an easy number to work with... ahhh spread sheets make shit sooo easy...

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post #6 of 16 (permalink) Old 04-09-2007, 10:10 AM
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110 or CAM 2 is airplane fuel which in most parts is still leaded - You can usually get 100 Ocatane Race Fuel which is unleaded
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post #7 of 16 (permalink) Old 04-09-2007, 10:14 AM
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well plane fuel but i was referring to regular gas.
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post #8 of 16 (permalink) Old 04-09-2007, 10:15 AM
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Alot of places still sell leded race fuel...

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I'd rather replace my brakes than my engine, so other than the occasional heel/toe downshift I don't put the stress on the engine of compression braking. It's not a diesel.
"I know right? Engine braking...thats crazy. Holy crap though...can you imagine engine acceleration? Jeezus. I'm glad I don't do that!"
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post #9 of 16 (permalink) Old 04-09-2007, 10:42 AM
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I remember on another topic someone posted a link to an online site that sold octane boosters/fuel additives that really did work, and were a lot cheaper than having to buy the actual gas. Anyone know the place?

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post #10 of 16 (permalink) Old 04-09-2007, 11:25 AM
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Where the heck is he going to get leaded fuel from? I dont think they really sell that anywhere in the us anywhere.[/b]
you may need to rethink it then... took this pic last season at a track event in vir...
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