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You could always try pulse and glide? I'm not as sure how it works with an automatic, or whether it might involve shifting into neutral, or forcing torque converter lockup with a switch under acceleration, but since your only seeking to average lower speeds anyways I would think that the difference between P&G with a 4speed automatic and a 3speed automatic would be almost nil. You need the extra ratio to accelerate up to speed afterall.
Whether there would be any shorter transmission life as a result of going into and out of gear I don't know, i wouldn't think so but something with 180k isn't going to last forever anyways. If there's enough attachment to the car it eventually provides the excuse when replacing the transmission to put in an OD at that time. : P
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