We&#x27;re heading in a good direction with turbochargers.  I suspect we&#x27;re getting close to the Carnot limits for gasoline engines [1].<p>Next steps would be adapting the regenerative braking technology, like that on the Porsche 918, into regular vehicles.  There&#x27;s a lot of kinetic energy wasted in brakes and we&#x27;re soon going to be able to recapture it.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Carnot_cycle#Efficiency_of_real_heat_engines" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Carnot_cycle#Efficiency_of_rea...</a>