I am waiting for my Prius (16 days and counting) but I have been using some of the things I have learned on this board and other sites in my present car a 99 Ford Explorer. I will be keeping this for the things it does well like logging roads, fording streams, pulling my tent trailer and for snow days. It has a mileage computer and I have been experimenting. Before I was getting 18-20 mpg(usually 19.5 per tank average). Good considering the EPA average is 17 city and 23 highway. Most of my driving is rural (40-50 miles per hour few stops) and city. About half and half for my daily commute. I now am getting 22-23. I have slowed down a bit, accelerate more slowly when safe, coast to stops when possible. Not bad I think. It is easy to get 16 mpg if you put your foot in it. I had to make an emergency run to the hospital, no actual speeding but fast acceleration and late braking. I was at ¼ tank and had 20.6 mpg for the tank and pushed to down to 16.7 in about 15 min driving. Having that immediate feed back from the trip computer in the car is invaluable. BTW it has been accurate every time I have tested it by calculation of gas used and miles. With in .3 mpg each time so I can trust it I think. I think a MPG display should be front and center on every car. B)