True Confessions - Premium Gas

[Jeph]

This would make a good survey, though it seems most people here are following their manual's recommendations. The manual notes that the less octane can throw the check engine light.

[MNBoxster]

Originally Posted by Jeph

... The manual notes that the less octane can throw the check engine light...

Hi,

Sure, makes sense. If the DME cannot adequately compensate for the lower Octane it would cause a MIL.

An Engine may operate fine on the Lower Octane, with the DME compensating for it. But, put the Engine under Load (High Speed, Passing, Going Uphill), or raise the Ambient Temperature (lowering the detonation threshold) and suddenly it cannot cope, which it signals to you in the form of a MIL. I suspect that you'd feel the loss of Performance just as the MIL came on too. Also, an Engine which is Knocking has to cause Havoc with the Emissions Readings from the O² Sensors too...

Happy Motoring!... Jim'99

[9000RPMan]

I use premium gas at every fill up. Why buy a premium sports car only to use cheap gas? If Porsche recommends 93, then 93 is what my car drinks.

[tqtran]

93 octane all the way, and if I can't find it I will add octance boost.
The way I see it, if you can't afford the $0.20 extra per gallon then sell your car and get a Honda.