What gas to use? - Page 2 - Mazda 6 Forums : Mazda 6 Forum / Mazda Atenza Forum
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post #11 of 449 (permalink) Old 12-06-2005, 02:08 PM
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Quote:
but i always use the medium one.......does it matter?
or does it hurt the engine or anything?
[/b]
It is really recommended that you put 87. By putting 89, you're wasting money and it might lower your fuel mileage.

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post #12 of 449 (permalink) Old 12-06-2005, 05:08 PM
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I use 89 currently and I don't care what everyone else says either way...I wont use 91 92 or 93 because - agree - it is over the top and not neccessary...Since I have the MTX trans I find that sometimes "under load" in the low rpm range the shifting is "more smooth" when using the 89 as apposed to 87...It's for me like using the "monster cable" on my vidieo equipment...

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post #13 of 449 (permalink) Old 12-06-2005, 05:15 PM
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Quote:
...Since I have the MTX trans I find that sometimes "under load" in the low rpm range the shifting is "more smooth" when using the 89 as apposed to 87...
[/b]


How does 89 octane gasoline give you smoother shifts?

Quote:
It's for me like using the "monster cable" on my vidieo equipment...
[/b]
Once again...

In this case, MT-90 for smoother shifts is equivalent to your example, NOT 89 octane!

Have fun wasting your $$$.


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post #14 of 449 (permalink) Old 12-06-2005, 05:31 PM
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Quote:
Since I have the MTX trans I find that sometimes "under load" in the low rpm range the shifting is "more smooth" when using the 89 as apposed to 87...It's for me like using the "monster cable" on my vidieo equipment...
[/b]
Like your 89 octance usage, monster cables or cables of equal quality actually make a difference when used with the appropriate system. A $50 DVD player hooked to a regular CRT TV doesn't need them, but you bet you'll notice a difference with HD signals

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post #15 of 449 (permalink) Old 12-07-2005, 12:49 PM
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There has been a lot of discussion about some sort of odd knocking sound when at low rpm's ... just as you step on the pedel to accelerate. You can compare how your car behaves as you change from 87 to 89 octaine and back again. To be fair - it really takes about 3 tank fills to fully "switch" over. I feel that the 89 octaine limits this "odd" behavior at low rpm's. Also if you are in 5th gear going uphill at about 60 mpr...floor your car in5th gear and see what happens...it has been my experience that 87 octaine will give just a slight "hesitation" while at (wot) (wide open throttle) going uphill (under load) while using 89 octaine provides a constant smooth acceleration. Feel free to give this a try...I don't see this as a waste of money. Once again - I agree - there is simply no need for 91/92/93/94 octaine. Perhaps I am wrong...it's sort of like a reluctance to actually buy no name brand Tylenol. Is CVS Brand Acetominofin "really" exacty the same as "Tylenol"??? Some say YES it's just that the no name is much cheaper because they were not responsible for expensive Research and Development (R&D). Others are steadfast and say NO the manufacturing process is not the same and what you get in the off brand may or may not really be "Tylenol". In the end you pay more for what you "believe" you get!!! Why else would someone pay good $$$ for bottled water and forgo the tap which is free??? Go ahead and try my hands on test...maybe just maybe...someone will actually agree...

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post #16 of 449 (permalink) Old 12-10-2005, 08:55 PM
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FWIW,

Octane rating is gas's ability to resist detonation. The higher the octane, the harder it is to detonate. That's why you need higher octane in high performance (high compression) motors and turbo (turbo creates high compression) motors. As compression increases, the gas needs to be able to resist combustion until the spark hits. If it doesn't, the motor will knock or ping.

A higher grade of gas shouldn't actually hurt anything. It'll burn clean. It's just that you don't need that quality in a lower compression motor.

A mechanic I know used to race legacy series stock cars (3/4 scale w/ 4 cylinders). He actually ran regular 87 gas in his race car because the motor didn't require any more.
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post #17 of 449 (permalink) Old 12-12-2005, 05:00 PM
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Any knocking can actually be caused by pinging (resistance to detonation not high enough in the fuel.) But this should only happen in very high temperatures or high altitudes and certainly has nothing to do with transmission smoothness. So if you noobs find your car is pinging (ask us first), you may want to switch to 89 for the summer months.
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post #18 of 449 (permalink) Old 12-12-2005, 06:46 PM
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Not to confuse the issue further...

But if your attending a high speed driver education event, it is also worthwhile to put in slightly higher octane (89) for a bit of insurance when your flying between 5,000 and 6,500 rpm for 25 minute intervals.





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post #19 of 449 (permalink) Old 12-14-2005, 06:08 AM
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I use to put in a higher grade just to be nice to my motor anyway. But with the gas rising up again. Its back to plain old 87.

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post #20 of 449 (permalink) Old 12-14-2005, 09:53 AM
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I run 93 bitches!!!

J/k why would you pay for something you don't need?

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