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It can't hurt, it can only help.
I've been doing it for decades but not primarily to save gas. The worst enemy of an automatic transmission is heat. If you can take a load off the transmission, especially in summer, so much the better. Considering that rebuilding a tranny is one of the most expensive repairs, I like to avoid problems. I also drain and refill it every six months. Transmission fluid is relatively cheap - again it can't hurt, it can only help.
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