I find that as long as I am not crawling up to speed or keeping the pedal on/near the floor. it makes little difference how I accelerate. I find that I end up accelerating faster than much of the traffic.
Re your tire pressures You may see very little difference fuel mileage wise between 40psi and 50psi. At that pressure you may begin to see center wear. You should monitor it checking tread depth at 3 points across the tire, recording then checking again in a few thousand miles.
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