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With 87-octane being about $4.50/gal and 91-octane about $5/gal, I've been filling up at the local Costco more regularly now. It's about a 50-cent/gal difference, so even on a daily driver that's worth about $5. On one of the 911s, with the 21 gallon tanks, it can be almost a $10 difference!
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1987 Venetian Blue (looks like grey) 930 Coupe
1990 Black 964 C2 Targa
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