What type of gas for a 2003 Subaru Outback?

Answer 1

If you have the H6 engine, the manual recommends supreme (i.e. 91 octane or better); otherwise, regular gas works fine. (The H6 will run alright on regular, too, but you'll get a performance drop of roughly 4 to 5HP, and if you drive at a higher altitude, you'll notice the drop moreso than those living closer to sea level.)