Skinnier, yes. Better MPG, it's a toss-up.
What I would recommend is getting some cheap 15" wheels. I got a set of Chevy Cobalt steelies for $10 last week and am waiting for UPS to deliver some brand new, LRR Yokohama Avid Ascend tires, on which there is a recent Ecomodder thread.
You can get 155/80 or 175/70 13" tires all day long, but they're not going to be worth a damn. If you have an EG Civic 175/70/13 or 185/60/14 are your stock sizes.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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