Let's compare the fastest Kei trucks, Kei Vans and Kei cars that are at least 25 years old and legally roadworthy in the U.S.(varies by state). This includes both standard naturally aspirated options and the rarer turbo or supercharged models. Even though the Kei trucks, vans, and cars on this list have a higher top speed, the extra power is mostly used for faster acceleration, since speeds over 50 MPH can become unstable depending on conditions and the model.