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Hello Neal. Welcome to EM.
That is quite the commute you have coming up! Your best and cheapest bet is to just use the pulse and glide driving technique. Your mileage will rocket up, but it is work. You might be able to find another transmission with slightly lower gearing, but it likely won't make a large impact on fuel economy. I'm not aware of any 5th gear swaps that would work for you. Your engine uses a very similar transmission as my 03 Matrix does, and I would have died to get a new 5th gear myself.
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