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Hello & welcome from a fellow Mass resident,
You may not see any improvement above 38 or 40 psi. I would try it progressively -- it will affect the ride, and if it starts the wheels jittering over rough pavement, it could affect the handling.
You might want to coast in neutral with the engine idling. In situations when you can carry your speed, this will greatly improve your mileage, since you will coast a lot further than you will coasting in gear.
In situations where you need to stop at the end of the coast, then leaving it in gear will be best -- the computer shuts off the fuel, so you get the same effect as turning off the engine; but without any downsides.
I personally will not do EOC (engine off coasting), because my car becomes very difficult to control -- and I'm a big, strong guy. But, coasting in neutral with the engine idling is not a threat to my safety, IMO. And according to my ScanGauge, I get up to 340mpg while coasting at 55mph.
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