Another reason P&G isn't ideal in automatics is the torque converter. What you want for P&G is high engine load, but low engine rpms. In an automatic, if you want high engine load you can't get low rpms, you get high rpms. High load also creates more heat in the torque converter and you loose some efficiency there too. When I drive an automatic I accelerate moderately fast while trying to keep engine rpms fairly low. You can learn to trick the car into shifting by letting off the gas a bit, waiting for it to shift, then reapplying as much as you can without downshifting too.
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