I have done a hard reser, but not with the Hyb fully charged and the mpg was around 44.mpg. so today 9/13 I sat in the car with foot on gas pedal till the Hyb was 100% capacity. Turned off engine and then disconnected the Hyb and then disconnected the negative end of 12V Bat and waited about 10minutes. Reconnected negative end of 12V battery and then reconnected the Hyb battery. the instruction were to baby the first 10 miles. I drove thru some streets where speed was 35mph and adhered to that and then got on a highway that circles the city in an area where no stoplights were and adhered to the 55mph and the total time was about 32 minutes.