I have kept track of my fuel usage for sometime and now have created a new spreadsheet for the data. My previous post claimed I was getting 31.34 MPG on average and I average about the same for 2007. Below are the charts and a graph with my MPG vs Time (over the year).
The graph shows that my MPG improved over the year, possibly because of rising gas prices and the want to consume less.
I have done a lot more driving this year and continued to keep track of the MPG. Also, I kept information on the price of the gas at the time of purchase for more recent fill ups. I should have the new chart posted around the end of the year.