Any car can outrun a tornado and you can easily turn around.
Any car can outrun a tornado
in optimal conditions. The edges of supercell thunderstorms usually produce very heavy rain and large and dense hail. Driving 60 miles per hour in such conditions can be dangerous. Counting on the roads being clear enough for you to drive this fast is also a bet I would not hedge, as there may easily be people on the road ahead of you not going as fast as you would like to go.
Another problem you may have is the formation of tornado clusters. Not everyone is a weatherman, so not everyone can predict the safest direction to evacuate. There have been several cases where people in vehicles have been stuck on the road in between two tornadoes that are a few miles apart. Add this to the fact that roads in the central United States can stretch for several miles without a good turnoff, so there are only two directions you can go.
And then, let us think about simply trying all of this at night where the sky is basically invisible.
Storm chasers are a different story. They know the risk, and they have equipment, knowledge, and information resources to help mitigate these risks. They have the capability to look up into the sky and see exactly when and where a tornado is likely to appear. Even such, many of them get in hairy situations all the time. A regular person putting themselves in the same situation is much more dangerous because they do not have the same equipment, knowledge, and information resources that storm chasers do.