Among other adjustments that could help double
fuel economy are turbocharging with smaller, more efficient engines that produce the same level of power; advanced heat
management and cooling
systems, which reuse the heat produced in the engine for energy; weight reduction, including broader use of high - strength steel that is
already in some cars today; better aerodynamics; more efficient air conditioners, transmissions and lighting devices (including headlights); and increased electrification leading to full hybridization with electric motor and regenerative breaking — all of which currently exist.