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Re: Premium or regular....
My vintage '60's stuff need premium due to their high compression (although they've all been in storage for a few years now.)
My '97 Caddy needs it, as per factory recommendation. It got regular once by mistake. It rattled like 8 rocks in a tin can and fuel mileage dropped by 15%.
My vehicles from the 70's and 80's do just fine on regular.
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