This was my first attempt at hypermiling - the average over this 2 minutes of data logging was 62.9 mpg at 55.0 mph. These results were achieved on relatively flat terrain, very light traffic, and the speed limit was 60 mph.
I used a Bluetooth wireless connection to the OBDII port on my car to log the data to my Android powered phone. No hands needed, it automatically logs from the time I start the car. The attached image is a graph of 2 minutes of sustained driving.
The big questing is, what kind of car was it
?