Only high octane gas can be used around 92
Premium Unleaded 91 octane fuel.
" regular " unleaded , 87 octane
What does it say on the dash? If it says "Premium Gas Recommended" or "Premium Gas Required", try running a mid-grade for a while. The Northstar has a pretty sophisticated anti-knock program, so if you get no ill-effects from running 87 octane, you'll be fine. I used 87 in my 99 Deville for about 100,000 miles and had no problems whatsoever.
regular unleaded - 87 octane
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