I agree about the 100+ tips list. I've done 48mpg on a test loop in a friends Mazda 3s (the 2.3L sport version).
I would not remove the spare. It's not that much weight, but the one time you need it, it's worth many MPGs the rest of the time.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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