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Chris,
As a general rule, the larger tire would be better for fuel economy. So the 225/45R17 would seem the obvious choice.
I don't have specifics on make and model, so I suggest you spend some time on Tire Rack's web site and sort out what you want the tire to do. There are compromises and what will work for you is something only you can decide. The most obvious compromise is the treadwear/traction/RR thing. You need to sort that out.
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