SARASOTA, Fla. — Retired auto dealer Robert Johnson died Sept. 2 at age 84. He founded Bob Johnson Auto Group in 1981. After a training program with a Chevrolet dealership in Indiana, he was awarded a Chevy franchise in Buffalo, N.Y., which he moved to Rochester, N.Y., in 1985. Johnson sold majority ownership of the group to a longtime employee in 2001. The group now has 17 locations, most in the Rochester region.