As far as performance metrics are concerned, are we talking about the current diesel motors with the fuel efficiency standards? Are we talking about what a diesel motor can do when it's allowed to do what it can do best? Are you talking about diesel electrics, in which case the natural gas is used to charge the electrical system, which provides the electrical torque? Because at that particular point it doesn't matter what energy source is creating the electricity because the electricity creates the torque.
So can you give me some clarification on these performance measures?