Hybrid power trains
Although it didn't make the top 5, we give gas-electric hybrid power trains an honorable mention here because they offer the best of both worlds: more power and better fuel economy. Just compare the
Lexus RX 450h with the
Lexus RX 350. The hybrid system achieves this seeming miracle by collecting energy from braking and excess engine power that would otherwise be wasted, and making it available to drive the car's wheels.