"Coolers" increase thermal load capacity in heavy-load condition such as track duty. Adding a transmission cooler for a car, nearly any recently-produced car, in a light duty condition even in a stop-and-go city traffic will not add "fuel efficiency". Same to be said with engine oil cooler. I also doubt that an open-element air cleaner would add "fuel efficiency"; several engine parameters need to be monitored and logged to determine a gain or loss.
I'd say save the money you're about to spend for mods and use it to pay for the fuel. If you insist on saving a few bucks, enroll in a few of the many fuel-reward programs out there. Welcome to the forum and enjoy the car.
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