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First, I don't think you'll find anything narrower in a 15". (I'm assuming you don't want to change wheels)
Second, I wonder why you would want to make this change. In the case of fuel economy, bigger is better - and by bigger I mean any of the 3 numbers used to determine tire size.
Besides, the difference between tires is SOOOO much larger than the difference between sizes. Careful selection of the tire (meaning make and model) is THEE most important thing.
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