Since N coasting is good, I think you should take a HWY drive and get some HWY numbers to see if the car is running properly.
And don't accelerate like grandpa, brisk acceleration with an auto to get it into top gear (or atleast highest gear for the PSL) as quick as possible without going over say 3000 rpm is better, if going between lights, accelerate brisk to just fast enough to neutral coast to next light. N coasting at 30 mph will net you +100 mpg.
If the speed limit is high enough you need to get the torque convertor locked up, but with my older auto's they won't lock up for 2-3 miles at below freezing temps ever at 55 mph.
Make shift engine heater, put a flood light under your oil pan and get a timer to turn it on a few hours before you leave in the morning, nothing to remember to unplug.
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