I looked at the arithmetic and it seems right, but my quick off-the-top-of-my-head estimate is about 82 mpg (3 parts at 60, 1 part at 'x'). I'll figure out which is right after I wake up a bit more, and finish watching Le Tour.

Addendum: I agree with your arithmetic.

Superb result. I presume you took a round trip. Any wind advantages ? What speeds did you drive ?
Perhaps I'll go back to some of your old posts where you insinuate that the 2G is overated, lol.

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."