Trying to outrun a tornado is about the worst possible thing you can do in a tornado situation. Take shelter: get underground, go into an interior room, lay in a ditch while covering your head if you have to.
Tornadoes are basically like three-year-olds throwing temper tantrums except instead of toys its cars, buses and trains they’re throwing around (but also toys too, which they can throw hard enough to literally pass through your body). A vehicle of any kind is about the last place you want to be when a tornado comes through.