After the engine is warmed up (about 5 minutes, or use in the past couple of hours) go out for a highway drive 10 miles to and back. Zero your tank odometer so your trip mpg is obvious. If the trip mpg at 60 miles per hour is less than EPA, further trouble-shooting is in order.

R2-E2, 2G Prius.
Highway/City/Husband/Wife MPG: 56.5, as of 12/2005, 26K miles

Jac Nasser, Ford President: "We are planning to launch a hybrid version of
this car [P2000] within this year [1998]. We will also make FCEV available in
2004."