Don't just vote, stake your claim and post it. As the poll creator, I don't want to sway the poll so I'm going to post mine later (it's the same that I posted many times before).
50MPG would be great even without the extra 40 miles you get. I hope you are right.The following site has government test data on the EV1
http://avt.inel.gov/pdf/fsev/eva/genmot.pdf
The interesting data relevent to this question about gas mileage at 70 MPH is the following constant speed data for the EV1.
45MPH=115 w-hr/mi(8.7 mi/kw-hr)
60MPH=164 w-hr/mi (6.1 mi/kw-hr)
If you crossplot this data you come up with some interesting conclusions:
1) Laukners claim of 130 w-hr/mi (for the highway drive cycle, avg MPH=48) plots right on the EV1 data.----just as BillR observed in his thread on 150MPG EPA rating.
2) Extrapolating the data to 70 MPH the EV1 gets 190w-hr/mi (5.3 mi/kw-hr)--excellent electrical efficiency!!
Now if we say that the volt will equal the EV1 in electrical efficiency as Lauckner is stating then we need to convert this number into MPG thru the ICE/ series drive train. With the following rather liberal assumptions of 37% ICE efficiency and 92% efficiency for the generator/inverter/motor and 33.4 kw-hr/gal heating value for gasoline we get 60 MPG for the volt at 70MPH.
Therefore I stick by my prediction of 50 MPG or better for the volt.