Cars Vs. People: What's More Fuel Efficient?

Ever wondered whether walking was more resource efficient than driving? Although we know we poop more when we exercise, this chart finally helps us to answer that question a bit more scientifically.
It turns out the human body is an extraordinarily efficient machine — much more so than even the most efficient car. Which gets us to wondering — shouldn't we be running our cars on people or Soylent Green?
While we ponder that question — take a look at the full chart here.

Source;
http://jalopnik.com/5165228/cars-vs-people-whats-more-fuel-efficient