At the end of the Right Hand Turns experiment, Kari announces that right turns saved 3% in fuel over left turns. This is actually way off and undercuts the benefit of the experiment. Rights consumed 4.0 pounds of fuel, Lefts consumed 6.8, so 2.8 / 6.8 would be a 41% savings. It appears someone divided the 2.8 by the 76.0 pounds of the entire gasoline supply rather than only what was consumed. Plus, the second demonstration went 50% farther on that lesser amount of fuel: 7.2 miles vs. 4.8 miles.
The narrator says the ramp is decked in plywood but it is in fact OSB, which is a particle board.