4. Ariel Atom 500: 2.43 lbs/hp
1213 lbs : Weight
500 hp : Power
Holy crap. Talk about a quantum leap forward: the Atom 500 has nearly a pound less per hp than LaFerrari. Think about that for a minute.
3. Hennessy Venom GT: 2.205 lbs/hp
2743 lbs : Weight
1244 hp : Power
God bless America. And England too I guess, since the Venom GT is based off of a Lotus. The incredible ratio explains why it can do this.