Higher octane fuel

[Yar Is Word]

I used premium in an ECHO for 5 years and always from name brands, not the cheap gas. The car simply ran smoother, it had more power, and got better mpg (about 2 per gallon). The increase in mpg did not cover the increase in cost but the peace of mind was worth it.
In the Yaris the first two tanks were regular. I felt the acceleration could improve. Since premium was put in a difference has been noticed. The car is relatively new so I don't have any long term mpg improvement data.
I have read a couple studies and many opinions such as the ones above stating that it's a waste but that has not been my experience.
A simple test would be to run premium for a few tanks and see if you notice any improvements.

[jambo101]

Originally Posted by Yar Is Word

I used premium in an ECHO for 5 years and always from name brands, not the cheap gas. The car simply ran smoother, it had more power, and got better mpg (about 2 per gallon). The increase in mpg did not cover the increase in cost but the peace of mind was worth it.
In the Yaris the first two tanks were regular. I felt the acceleration could improve. Since premium was put in a difference has been noticed. The car is relatively new so I don't have any long term mpg improvement data.
I have read a couple studies and many opinions such as the ones above stating that it's a waste but that has not been my experience.
A simple test would be to run premium for a few tanks and see if you notice any improvements.

This attitude is what the oil companies are after,Someone who is totally misinformed and think the higher octane gasoline somehow gives more power,better gas mileage and somehow works better than what the engineers who designed the engine recommendI think this attitude has been perpetrated by all the fancy names they call the higher octane gasolines relegating the lower octane gas as an inferior alternative to Premium,Gold Ultra,Super etc.When in actuality the only difference between 87 octane and 93 octane is detonation parameters not the quality of the gas.The owners manual in all Yaris and Echo's call for the lower octane rating of the usual three choices of gasoline.If there was any merit to the higher octane = more power and better mpg dont you think the car companies/engineers would be the first to recommend the higher octane gasoline.
The logic of buying an inexpensive automobile who's forte is fuel economy then putting a more expensive higher than recommended octane gas in it escapes me.