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Originally Posted by UberRoo
I calculated the difference in cost between the premium grade and the cheap stuff and found that it only costs me about $100 per year.
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Personally I think it'll be a wash. From my experience with my former 300ZX TT (yeah I was a poor college student at the time), when I could afford premium gas my mileage would be around 21-22mpg in mixed city & highway. When I ran 87 octane, it would drop to around 19-20mpg in similar driving. I wouldn't be surprised if the extra 2 mpg I got in fuel economy when I ran premium would effectively make the cost-per-mile similar to when I ran regular.
-Chike