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First, changing tire size has a small affect on fuel economy - all other things being equal.
What has a much,much bigger affect is careful selection of the tire itself - up to 60%!
What also has an effect - albeit on the same order as the size change - is going larger (because it is in essence a size change). The tire size you have is not very popular and some folks have commented about the difficulty in finding a good selection in that size. Going larger can solve that particular problem. Just be aware that there are clearance limitations with regard to the fenderwell, the strut, and the wheel width. Unfortunately, I know of no one who publishes a chart showing how big you can go, but rule of thumb is 2 sizes.
Also be aware that going larger will change your speedometer and odometer.
Frankly, I wouldn't waste time thinking about going to 14". Stick with the 15" and use a larger size.
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