Thanks for all the input. Looks like I sparked quite the discussion..
I wound up with P185/70R14 tires. I got a good deal on 2 different pairs of like-new tires (>90% tread remaining) in that size. I've only put maybe 30-40 miles on them, but if my Scangauge is accurate (I adjusted the offset for the new tire size), it uses more gas to accelerate, but less gas at cruise. I'm guessing this is due to higher gearing with the taller tires. Not very scientific just watching the Scangauge right now, but I'll post back with some real numbers after a week of commuting with them (~600 mi).
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