Yes but you have to buy a car with a huge battery pack and crap performance (including the i8).<p>I drive an M3, I&#x27;m not going to give up fast vehicles until self-driving cars are mandatory.  Regenerative braking (with a small battery pack) could double the fuel efficiency I obtain.  The existing regenerative braking systems available are horrible (in a number of ways) and not comparable to what&#x27;s in existence for F1 and the 918.<p>Regenerative braking for most cars now is where turbochargers were pre-1990s.  The system I&#x27;m talking about can run only a few miles in full electric but gives a substantial boost in fuel economy because it&#x27;s utilized for most acceleration below ~100 MPH.