Many years back, the Engineer Zubris allowed his Patented circuit to be used on home built electric cars and motorcycles for Royalty $100 with advice for each unit made. His circuit adds a quick discharge current from capacitor into main winding of motor, a split second before heavy amps goes in. The back EMF (resistance) is removed, and car gets faster acceleration and double mileage before recharging battery. His wife was mostly driving the electric converted VW bug . One day he drove it, and it quit on side of road. Wires and parts were added to get it going again. The battery gauge on dash then seemed to be much slower to discharge. After studying the circuit, a Patent application was done and issued to him.
Reminds me of Nikola Tesla's patent US416193A
High ohm coil right before the heavy amperage coil..
Is this patent ...
https://patents.google.com/patent/US3809978A/en (https://patents.google.com/patent/US3809978A/en)