Octane

[Cyberian]

Moonbeam -
Stick to what you know best.
This is a quote from your FTC quote:

However, some cars with high compression engines, like sports cars and certain luxury cars, need mid-grade or premium gasoline to prevent knock.

Now would you have owners of these cars use regular (87 Octane) gas?

 

[Moonbeam]

Cyberian, I said nothing about what gas he should buy. I said what gas gives the best mileage and under what conditions you need to use a higher octane gas. His owners manual says he can use down to 87. Regular is 89. 91 is ideal, but he has a 95 car. I doubt his compression is what it was new. He can, and if he were interested in economy, use the lowest octane he can. I would recommend he use regular if he has no pinging, yes. It's cheeper and you get better mileage. I would also like to see the next page of his manuel where it starts in again about 87 octane. You read me a single sentence. Thinking requires the comparison and contrasting and assimilation of all the available data. The conclusion: use the lowest octane you can that doesn't ping badly, or waste money of subjective notions that higher and more expensive is better. That is definitely what the oil companies what you to do. I always feel best conforming to the latest TV ad.

 

[IGBT]

High octane gas has less BTU's per gallon thus less energy. The octane boosters are designed to slow the combustion and contribute nothing to the overall BTU value of the gas which results in less gas milage.

 

[WinkOsmosis]

Originally posted by: Moonbeam
Cyberian, I said nothing about what gas he should buy. I said what gas gives the best mileage and under what conditions you need to use a higher octane gas. His owners manual says he can use down to 87. Regular is 89. 91 is ideal, but he has a 95 car. I doubt his compression is what it was new. He can, and if he were interested in economy, use the lowest octane he can. I would recommend he use regular if he has no pinging, yes. It's cheeper and you get better mileage. I would also like to see the next page of his manuel where it starts in again about 87 octane. You read me a single sentence. Thinking requires the comparison and contrasting and assimilation of all the available data. The conclusion: use the lowest octane you can that doesn't ping badly, or waste money of subjective notions that higher and more expensive is better. That is definitely what the oil companies what you to do. I always feel best conforming to the latest TV ad.

The car runs with 87 octane, but that doesn't mean it's supposed to use 87. On a lower octane than 91, the ECU retards timing to reduce the compression.
I can afford it.. I drive only a few times a week, since I take the bus to campus.