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Message started by maephisto on 08/17/11 at 03:47:34

Title: gas 95 vs 100
Post by maephisto on 08/17/11 at 03:47:34

Hi!

Did anybody try to use gas with the octanic number 100 ? I've allways used 95 and i was wondering if the 100 one makes any difference in power. and, is it safe to use ? (i think the recommended one in the manual is 95).
Thanks!

Title: Re: gas 95 vs 100
Post by MotoBuddha on 08/17/11 at 05:12:40

It makes you go faster by lightening your wallet more.

There's a general misunderstanding about octane. It doesn't contain special power boosting ingredients. It exists to keep high performance, high compression engines from damaging themselves. They need higher octane gas in order to prevent pre-detonation. Compressing a substance creates heat. The high compression in some engines can cause enough heat to make the gasoline ignite before the spark fires, which is not good. Octane helps prevent pre-detonation by making the gasoline burn slower. Putting high octane fuel in an engine that doesn't need it accomplishes nothing but making oil companies richer. The exception, though, is on modern fuel injected, digitally controlled engines with knock sensors that can advance and retard the ignition to the threshold of pre-detonation, yielding a wee bit more power.

Title: Re: gas 95 vs 100
Post by 12Bravo on 08/17/11 at 06:24:28

I stick with 87 octane for my 07. I found that it gets less MPG and knocks bad if I use higher octane gas. Each bike is a little different and it also depends on where you live (altitude/humidity) on what octane is to use.

Title: Re: gas 95 vs 100
Post by Gyrobob on 08/17/11 at 06:41:14

Motobuddha does not tergiversate.

As he maintains, more octane does not mean more power. Unless you have a detonation (pinging problem) on regular grade gas, it usually means less power.

The best idea is to use what the manual says to use. Using a higher octane pleases only the oil companies.

One comment on Moto's statement, "The exception, though, is on modern fuel injected, digitally controlled engines with knock sensors that can advance and retard the ignition to the threshold of pre-detonation, yielding a wee bit more power." This is only true if the car were designed for the higher octane fuel.
-- IOW, my wife's SUV will not make any more power because the knock sensors sense a better capability for suppression of detonation. It doesn't detonate on 87, so it won't advance the spark if she puts 100 octane in it.
-- His point applies to cars that are supposed to use premium, like mine. If I put 87 in it, the sensors and computers will readjust timing and mixtures, etc., to do the best it can with that fuel. A couple of times I have had to put in some 87 octane -- it noticeably decreases power, and, while I only have one data point, it decreases mileage.

Title: Re: gas 95 vs 100
Post by BillF6531 on 08/17/11 at 12:42:56

You seldom hear mild detonation on newer vehicles. If you have a scan tool, hook it up to your wife's SUV and read the timing and knock learn factor while driving on the highway using cruise at 60 mph. Then fill up with premium, disconnect the battery for 30 seconds, and then repeat the test. I believe that you will find higher timing and a lower knock learn factor. Higher timing at cruising speed equates to better fuel mileage. But just to be clear - higher octane fuel in our bikes will make zero difference, since the timing is fixed / static.

Title: Re: gas 95 vs 100
Post by Gyrobob on 08/18/11 at 03:33:36

143F3A3A1060636567560 wrote:

Since hers was made in 1998, I doubt it is that smart.

Title: Re: gas 95 vs 100
Post by BillF6531 on 08/18/11 at 08:31:00

I had a 1998 Toyota 4Runner Limited 3.4 litre V6 4x4, and the scan tool would show more timing with premium fuel, but it made no fuel mileage difference.