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The difference in fe between 35 and 44 psi ain't a whole lot. If the passengers want 35, let 'em have 35.
If you aren't ever- or are rarely- getting into top gear and/or overdrive then that's one of your biggest problems. On that note, it is possible to accel too slowly and take too long to get in top gear. Accel briskly but then, as you do, let off at the lowest speed where top gear engages and go from there.
I wouldn't downshift to slow down in town. I coast- usually in D- to a degree that makes minimal braking necessary only at the very end. It's a generally true statement, though, to drive as if your brakes are the enemy.
Block heater, grille block (at least partial), and engine blanket would all help on those multiple short, cold trips. If that is all this car ever sees, it might be beneficial to take 'er out on the freeway once in a while and run the snot out it- get it warm for a while. That is the "Italian tune-up".
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