It occured to me that someone here may be able to do a test that would answer the question. :idea: If one was able to find a hill that they could coast down at a steady 60 MPH, and if they could measure the angle of the hill or use a GPS to determine their loss of altitude with respect to time, it should be relatively simple to calculate the energy used (knowing the weight of the car and driver).

This information would be very usefull in determining what the ultimate mileage of a plug in Insight could be. It could also determine the size of motor required for an electric conversion, or it could be used to determine the tank to wheel efficiency of the Insight.