U.K Patent No. 1,405,575 (.pdf)
In response to the energy crisis of the '70's, Mr. Arthur Pedrick invented a device for "Propelling Automobiles Without Using Petrol, or Gasolene". Looking past the very artfully "scientific" title, this patent looks a bit more like a way to "put the cart before the horse", as they say (and, in fact, as Mr. Pedrick jokes later in the paper). After lamenting about how the "complete solution" to the energy crisis - therm0-nuclear hydrogen fusion power plants running off sea-water - are too far off to solve immediate problems, Pedrick describes a way to get a horse to push a car. As you can see in the artful diagram, there's a cart full of feed (2) in front of the horse (4), just barely beyond its mouth. Using hydraulics, the driver can control how close to the feed cart the horse can get and thereby control the speed at which the horse pushes. There's also mention of connecting the car's starter to an electrode placed on the horse's ass: think of it as spurs to get a little more juice. Plus, Pedrick mentions that you could put speakers next to the horse's ears, and use them to say "Gee-Up" or put on music such as "The Teddy bear's Picnic" with a fast tempo for the horse to march to. And of course, there's a water-proof cover to keep your horse dry.
Honda, forget about the hybrid. THIS is the solution to oil dependency!