Fuel Economy

[lispat]

Originally Posted by yariman

The Yaris engine is designed to run on the fuel that is recomended in your manual. ( different parts of the world ) Unless you can change the timing and fuel maps etc. it won't run any better on a higher octane fuel. There are more additives in better fuels such as Chevron has more Techron in their higher graded fuels.

I tried higher octane in my Tacoma, it doesn't like it, I would stay with what Toyota says, they have a lot of expertise. If not we'd be driving something else. Ooooh, I wouldn't like that.