[mpgmike]

The X-Prize committee mandated a few modifications that had nothing to do with fuel efficiency. We had to have a fire extinguisher within reach of the driver. We had to add a tow hitch to pull the portable emissions analyzer during testing. The exhaust tail pipe required modification to interface with said portable emissions analyzer. They gave us a transponder that had to be wired into the OBD II and a few other places so data could be monitored remotely from some booth. They required a separate fuel tank, with a fuel-flow meter tied to the transponder. We were required to provide a battery disconnect switch incase of emergency.

I know that none of this relates directly to fuel economy improvements, but I note it historically for future researchers.