This is a wonderfully translated video of a (Russian?) man filling four car tires with concrete (after using engine cleaner and a long torch to demount the tires from the wheels), then driving on them. The results are surprisingly impressive. So impressive I just filled my own tires with concrete so I never have to stop for air again. Amazingly, my gas mileage is the exact same as before. RIDDLE: How can that be? “You drive a bicycle.” I knew you were a thinker!

Keep going for the actually very entertaining video (the voice-over translation is definitely value-add). I also liked the cat.

Source: Geekologie – Very Informative: Video Of A Guy Filling Car Tires With Concrete