On a recent trip to the beach (May 2007) I tried my hand at some hypermiling on the way back. Below are the gauge readouts of the trip computer. I maintained an average speed of 55 mph on Rt 113/Rt 1 and then 65 mpg on Rt 1 on the toll sections. Although every single person passed me (whatever, what's the rush) I believe I pulled off some impressive numbers. Average speed was 53.8 (odd, but I guess it also factors in stop light time) and average consumption was 37.9 MPG. To the beach in just over 2.5 gallons. See images below.

Link to a site about hypermiling.