With premium you get better mpg, the engine will perform better and probably last longer. But if you are person that buys and sells their car all the time then it doesn’t matter to you. I keep cars for 20 or more years so it matters to me.
“With premium you get better mpg, the engine will perform better and probably last longer”
False unless the compression ratio and other characteristics of the combustion chamber and ignition timing are designed to require it.