All Colorado gasoline is blended, there are no places left selling pure gas.
Nearly of my equipment is older and has whatever came on it as of the date of manufacture which in some cases is the later 60's. On both small and large engines I leave the fuel in it it had at last use. I do use additives, both Stabil since it has been available as well as Seafoam. Before these products became something more than a novelty I would turn off the fuel and let the motor run dry at storage. Leaving the old fuel in was cause for pulling carbs apart at the beginning of the season to clean them out, and this was when straight gas was still available.
The only thing I have noticed since having the blended is and increase in tank rust before I started using the storage additives. I did notice a difference in power, and economy when we changed mixtures in the spring and fall, but, as the state has decreed that all fuel will be mixed, it is a mute point anymore.
They also used to use propane and butane in the past to improve the octane rating.
Colorado only sells 85, 87 and 93, mostly I run the 85 it is not worth the time effort and worry to do the search for other fuels. I have noticed no issues with small or large engines leaving the gas in or running a specific octane rating, what I have noticed is that I do have to use the additives to keep my tanks from rusting as to where I did not notice the problem in the past. Treating the gas is nearly mandatory anymore due to the alcohol.
I have not noticed any issues with the rubber hoses, but most of my diesel stuff is from the late 80's or newer so it could already have the newer rubber.

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