Is it safe to run premium in my 2015
5.7 L challenger or only 89 octane I
ask because I like to run premium it
the only thing you can buy that is no
you can run premium , I don't think ethanol will hurt that motor being a 2015 . I spend extra for the premium blend for the same reason , I have older cars/trucks and don't want the ethanol . And I guess if no one buys it there won't be any for the small engines . The ethanol is a cheaper oxygenator than what's used in the higher octane .
I don't like ethanol but I would use premium anyway in such a car. If you ever store it for an extended period of time fill it up with 100% gas.