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<div>91 Octane just isn’t good enough.Especially when it’s hot outside.I’ve been mixing 100 octane at about3:1 pretty much all the time now, but I’m not sure which is less irritating; driving on 91 or paying $8 per gallon for 100. I’m driving the car a ton, plus using the brew in my motorcycles and ATVs.I think I’ve spent more on gas than food over the last 3 months.[/quote]</div>
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<div>Anybody know of a cheaper source of decent fuel?Or any other suggestions?I’ve tried octane booster additives and they don’t work.[/quote]</div>
I almost hate to mention it, but 110 in our area (at the track) is only $5.50/gallon, I say only... [img]/fckeditor/editor/images/smiley/MWPX/teeth_smile.gif[/img]104 is the same price. There is a CitGo station near me with 104 as well and I think it is $5.29 a gallon or it was last time I checked... I've never had a problem with 92 from a regular station though...
I'm also lucky in that 93 octane is all my Cayman S has ever eaten to date. The best part is that the only station I know of (that close anyway) selling it is only three blocks from my house. Last price I paid was $2.75 a gallon. Sorry that doesn't help you, but you're welcome to come visit...
We need to compare apples to apples here. The 'higher' octane is (R+M)/2 which isn't the same as AKI.
So an (R+M)/2 of 100 is like a AKI=95 and not like an AKI=100.
I run AKI=91 with no problems whatsoever. And just recenlty, I happened upon a Shell Station in Lodi, CA that servered up (R+M)/2 = 100 ($6.99 gal) and I did a mix that would give me AKI=93, which is what Porsche recommends. (Note that a higher octane will not hurt or help the engine, beyond that which makes it no longer knock (pre-ignition)).
And guess what, no noticable change in performance. Maybe I got better mileage, but I couldn't really tell.
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Cayman S - a portable amusement park
Larry, what does AKI stand for? Is the correct teminology 87 AKI or 91 AKI rather than 87 octane etc? neil
Anti Knock Index. It is fine to call it all octane. But, octane is measured in different ways. And no matter how high the octane is, once your car runs 'right' it will not benefit from any higher octane. And since the spiffy electronics that our cars have make timing adjustments for any instance of knocking (within reason), it may not be too advantageous to run any higher octane than AKI=90. There 'may' be some measurable improvement at or above AKI=93, but my BUTT dyno couldn't tell the difference.
Further, two equal octanes from two different brands of gas could make a noticeable difference. A research octane rating of 100 and a motor octane of 90 and a research octane of 90 and a motor octane of 100 yield the same (R+M)/2 = 95. But one's car can react differently. That is because the R is measured differently than the M. One is high rpm knock and the other low rpm knock.
I posted a link to a pretty extensive article on here somewhere.
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The search tool is your friend. It is very
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answered countless times.Very,very likely.
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Cayman S - a portable amusement park
As a general rule using a higher octane gas than is needed to prevent knock is a waste of money. However, vehicles with an electronic control module (ECM) also have a knock-sensor device. When the sensor detects knocking, the ECM retards the engine's ignition timing to eliminate the knocking. This happens so quickly that the driver never hears the knocking. But retarding timing decreases power and fuel economy. A higher-octane gasoline may improve the performance of knock sensor-equipped vehicles. I suspect that if you feel the improvement it is because the lower octane gas is causing the ECM to degrade your engines performance. You folks in California also have your own blend of gasoline that probably has a negative impact on performance.
