Premium versus Regular

[d57tbird]

Many of my friends put premium into their regular cars…waste of money. I can run 87 octane in my 87 Porsche 944S which requires 90. Knock sensor takes care of it…slight loss of power in my opinion, but my brother notices no difference when he borrowed it and tried both octanes. My daughter’s 94 Galant pinged on 87 (87 okay per manual) and it failed NOX emissions. No pinging on Premium. Base timing was too advanced, set it to spec, passed emissions, doesn’t ping on 87, but runs like a normal 4 banger. Ran like a scared rabbit before. On my old cars, I set the timing so I can use regular, but I was using premium in my 57 Thunderbird until the premium last tankful lifted the decade old paint where it spilled out the filler. Also took the paint off the fuel filter on the Galant when I changed it. Some additives! I wont’ mention the brand…the boys at the local Speedway may not like it.