white2.5i Posted July 26, 2006 Share Posted July 26, 2006 I've tried a few tanks of 89 and noticed better performance, wonder if I should go higher? have anyone tried octane in the 90s? Link to comment Share on other sites More sharing options...
Xenonk Posted July 26, 2006 Share Posted July 26, 2006 well, you do live up north, so the air is a bit dense than down here.. there is a diminishing returns as an octane rating is nothing more than to prevent knock or pre-combustion and the cost of paying too high of an octane is just wasting money. Keefe Link to comment Share on other sites More sharing options...
AWDDAD Posted July 26, 2006 Share Posted July 26, 2006 I used to put 91/93 in mine before the gas got expensive, I now go to Kroger to use there gas...89, its typically 10 cents cheaper a gallon. I actually get the same gas milage. ...when death calls, Im good. I got caller ID. Link to comment Share on other sites More sharing options...
SeattleLegacy Posted July 26, 2006 Share Posted July 26, 2006 ^^^so, why use the higher octane gas if you don't get anything out of it??? Link to comment Share on other sites More sharing options...
AWDDAD Posted July 26, 2006 Share Posted July 26, 2006 it was out of habit, my previous cas had a turbo and the car before that a supercharger. so when i pulled to the pump id naturally hit the higher octane. ...when death calls, Im good. I got caller ID. Link to comment Share on other sites More sharing options...
itzed Posted July 27, 2006 Share Posted July 27, 2006 Lower octane fuel is actually more volatile - it has more explosive power. Additives are added to low octane fuel just to make it less explosive, and hence raise the octane rating. This higher octane fuel is for engines with higher compression and hotter combustion chamber designs that could cause a more volatile fuel to ignite by a hot spot before the spark plug even fires. That's called detonation, it sounds like a knock - and it's bad. If you're not getting a knock using the low octane gas specified for your car, then it’s operating as efficiently as it can, the explosion is as powerful as it can be, and you won’t get any extra power by switching to a less volatile fuel. Link to comment Share on other sites More sharing options...
mustangendsley Posted July 27, 2006 Share Posted July 27, 2006 I use 91 octain at all fuel ups. I tryed the lower 89 and really my engine did not like it at all. Has anyone expereanced this? Link to comment Share on other sites More sharing options...
Edvig Posted July 27, 2006 Share Posted July 27, 2006 Isn't the 2.5i engine tuned for 87 octane? Link to comment Share on other sites More sharing options...
aldouse Posted July 27, 2006 Share Posted July 27, 2006 I use 91 octain at all fuel ups. I tryed the lower 89 and really my engine did not like it at all. Has anyone expereanced this? well the thing you have to keep in mind is that you have the GT. the turbo engine doesn't really like 89 octane and below all too much. Whereas we the owners of the NA engine dont really require the high grade octane. i have tried using the 89 and 91 octanes for several fills each. i have to admit that the 89 and 91 "seems" to perform a tad bit better... but the power gains between 87 and the other higher octanes just cant justify the huge cost difference between them. -- yay for the sig! -- my garage! Link to comment Share on other sites More sharing options...
themute Posted July 27, 2006 Share Posted July 27, 2006 I use 91 octain at all fuel ups. I tryed the lower 89 and really my engine did not like it at all. Has anyone expereanced this? that's cause you drive a gt they are made for premium gas only. if you have a regular 2.5i just use 87. that is what they are made for. i used to get 93 all the time in my RS, stupid mistake that was. if your paranoid about how "unclean" it is... Chevron Products - Techron Concentrate Plus that every so often and you're good to go. Link to comment Share on other sites More sharing options...
SLegacy99 Posted July 27, 2006 Share Posted July 27, 2006 Isn't the 2.5i engine tuned for 87 octane? Since 1997. My '96 cost me a fortune at the pump. Its been proven that if you do a lot of hwy driving (long trips are good) then you should use 89 octane instead of 87. One gets better gas mileage that outweighs the extra cost. Link to comment Share on other sites More sharing options...
Edvig Posted July 28, 2006 Share Posted July 28, 2006 Its been proven that if you do a lot of hwy driving (long trips are good) then you should use 89 octane instead of 87. One gets better gas mileage that outweighs the extra cost. I'm sorry, this doesn't make any sense to me. Link to comment Share on other sites More sharing options...
SLegacy99 Posted July 28, 2006 Share Posted July 28, 2006 I'm sorry, this doesn't make any sense to me. Test if for yourself. Youre not a GT owner right? Because then it wouldnt make sense to use anything lower than 93. Link to comment Share on other sites More sharing options...
themute Posted July 28, 2006 Share Posted July 28, 2006 Test if for yourself. Youre not a GT owner right? Because then it wouldnt make sense to use anything lower than 93. i have a RS. i get the same mileage with 87 or 93. legacy or not. Link to comment Share on other sites More sharing options...
aldouse Posted July 28, 2006 Share Posted July 28, 2006 Its been proven that if you do a lot of hwy driving (long trips are good) then you should use 89 octane instead of 87. One gets better gas mileage that outweighs the extra cost. i have noticed this too. i get an average of an extra 30-50 miles on 89 vs 87octane during my drives from milpitas/sanjose to san diego. and if my driving habits are questioned... i cruise control at 75mph on I-5 for about a good 360 miles w/o hitting traffic. and this is where i get my basis of the extra 30-50 miles on the tank. -- yay for the sig! -- my garage! Link to comment Share on other sites More sharing options...
SLegacy99 Posted July 28, 2006 Share Posted July 28, 2006 i have a RS. i get the same mileage with 87 or 93. legacy or not. Yeah but are you doing strictly hwy driving? Link to comment Share on other sites More sharing options...
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