I think the article was wrong. It said the jeep got 17 mpg, but it clearly says 20 MPG on the EPA sticker.

So the Prius didn't do that good compared to the Jeep. Anyway.

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."