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.