Filled up again at my local Costco with 10.578 gallons. After going 384.0 miles, that worked out to just 36.30 MPG. This was disappointing and the worst mileage in a month. But coming off of a great mileage of near 39 with my last tank, it evened out a little bit.
It appears that, although my pumping style is the same each fill-up -- pump until the first click, count to ten and pump again until the second click -- the amount of gas between the first and second click is sometimes a lot, maybe half a gallon, and sometimes a little, less than a quarter gallon.
With a small gas tank like mine, this difference can affect mileage by half-a-mile-per-gallon.
Overall, the mighty Corolla has returned overall mileage of 36.23 MPG, and averaging 36.68 MPG in 2007.
Interestingly, with all the news of record high gas prices, at $2.789/gallon, gas is just three cents more this May than last May, and well below the highest I have ever paid for gas, $2.959.