homesick
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Pessimistically, 1 gal of gas equals 10 stop'n'go miles. Optimistically, as much as 25 highway.
So a 25 gallon tank (never run it bone dry) should cover between 250 and 625 miles.
Price of 91 / 93 in NYC is about 30% higher than the price of 87.
250 * 1.3 = 325 miles ... 625 * 1.3 = 812 miles
If 91 / 93 doesn't improve mileage by enough to offset its additional cost, then save your money.
This sounds like good advice, if you're willing to ignore post 8.
joe