As far as shifting in and out with the automatic, it depends on the vehicle. Mine for one does not like to go back into gear at anything above 25 mph. Anything above that it pretty much has to run itself through the gears again and then takes a bit for the TCC to re-engage. So it's not worth it to P&G for me. Even trying to lose speed, then regain speed.. doesn't amount to any gains either. Your mileage may vary.
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Winter daily driver, parked most days right now
Summer daily driver
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