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Re: Premium or Regular gas? Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 14 Dec 2000 13:52:09
In Reply to: Premium or Regular gas?, Jerry, Thu, 14 Dec 2000 13:11:30 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Octane rating is a measure of how resistant the fuel is to knock. Higher octane fuel contains no more 'energy' or power.
Modern engines have knock sensors, turbo or not. In your S engine, if knock is detected, timing is retarded. Also, if an engine is knocking, not only is it doing some damage, the engine is producing less power.
Use a high enough octane fuel so your engine doesn't knock and still produces rated power. Using any higher octane is a waste of money. The trick is that since most engines can do some octane accomodation by reducing power, you want to get all the power the engine will provide.
Basically, cut back on the octane rating of the fuel you use and see how the car performs. Once you start noticing a drop in power, reduced driveability, or engine knock, go back up a grade. This may take a few tanks to tell. Try to keep to the same brand of name-brand gas.
You can't go by what other people's cars need. Each engine is different. The leave the factory all a little different, and the differences grow over time and use. One 2.0l non-turbo engine may require 91 octane where another is quite happy with 87. You don't buy gas for the other guy's car (or at least I hope not) - do what works for your car, for the way you drive it.
"Premium" gas not only has a higher octane rating, but it also usually contains extra additives like fuel line cleaners. Don't buy it for those. You can always add a can of quality fuel line cleaner every few months for much less than the additional price.
, Fri, 15 Dec 2000 03:57:37, Thu, 14 Dec 2000 13:52:09 <-- Viewing This Message
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