Crappity!

With my brain apparently in some other orbit, I filled the Endeavor's tank with gas ...

only to realize it was with the wrong freaking octane!

Mitsubishi engines are made for premium & they mean it (I pumped regular).  The one time I tried mid-grade in it, it bucked like a rank pony.

Can't siphon it because of where the tank is (Brian has tried to filch some gas from me before) so the plan is to run it & top off the tank with premium every time.  (Brian said not to bother with an octane booster.)