Need more info. How are you determining MPG (hand calculated, or from the guess-o-meter)? If you are using the guess-o-meter, it makes guesses based on Trip A miles driven. If you haven't reset Trip A miles since returning from your trip, it is factoring in your excellent fuel economy from the trip along with your normal around town driving.
Wearing in new tires and warmer weather will certainly help MPG.
I'd attribute the gain less to your foot than to other factors, unless you have been using the left pedal less than normal after the trip. In my Prius, it seems to matter less how I accelerate, and more that I keep my speed down and anticipate stops and slowdowns.
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