The committee ruled that in order to compete in the Indianapolis ' 500 , ' the Cummins diesel racer had to average over 80 MPH over its 10 - mile 4 - lap time trial run .
Was not eligible to receive any prize money .
The committee ruled that in order to compete in the Indianapolis ' 500 , ' the Cummins diesel racer had to average over 80 MPH over its 10 - mile 4 - lap time trial run and was not eligible to receive any prize money .