Thanks, Schwa. That simulation is really quite nice. But (and please correct me if I am wrong) it does not seem to model correctly the situation where the car is travelling faster than 43 mph and ICE off.

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."