As others have mentioned after breaking in it gets better gas mileage. For me the biggest effect on MPG is the air temperature.
My 370z seems to get the best MPG when its 70-80F out and worse when its hot or cold out. I used to get 26-27 MPG on my way into work (40 miles and 95% highway) and around 25 MPG on my way back.
Now that its been a bit cooler out (50-60F) I only get around 24 MPG on my way in to work and 23 MPG on my way back home.
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