+1.
Practically every vehicle I've driven past 15-20 years with alcohol in it, engine runs better, tranny shifts less, mileage increased. But money wise it works out about a wash. I had an early model Tundra PU, and one winter it would hardly start after a steady diet of below top tier 87 gas. One tank of premium 91 shell cured that; almost immediately
Just my 2 micrograms, ymmv.
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