Premium Gas Recommend

On my dash it says "premium gas recommend" does that mean I have to use 91/92 octane gas or can I use 89/90 octane gas?

Radio Won't Work At Night Time

No Power To Any Doors

None of my switches work on any of my doors . The windows, locks , mirrors. Fuses are all good.


How Can I Bypass The Security System

I need to know how to bypass the security system in my 2001 Oldsmobile Aurora 4.0 I think it is draining my battery and I need to disconnect it. I'm a female and don't know much about cars.