Just filled up the tank with 91 octane premium fuel

[ern-diz]

This is such a fuzzy topic of discussion for me.

There are those that swear 91 is better for your engine than 87 is. Then there are those that swear it is not. There are those that claim 91 is only for high compression, performance engines, while others say the 1NZFE actually runs at a pretty high compression (10:1, or something??).

I used 91 for the majority of my Yaris' life and switched to 87 more recently. Can't say I noticed a difference. I don't mind paying more and I don't mind paying less - what I do mind is doing the wrong thing for my engine.

I wish there was more of a consensus on what fuel we should be putting into these cars.

[WeeYari]

Originally Posted by ern-diz

I wish there was more of a consensus on what fuel we should be putting into these cars.

Every consumer watch dog type of report will state using premium where regular is stated is throwing money away. The big gas companies are great at marketing the premium fuels as being superior regardless of the octane recommendation from the manufacturer. Of course they are. Look at the profit margins inherent in the price differential. In Canada, this is approximately $.20 per liter.