I don't think it's useful to compare minimum wage, which is a fixed floor, with the average cost of a new car, which will float upward if rich people buy more expensive cars. I also don't know why you would limit yourself to new cars, since the least expensive cars are typically used--and cars have undoubtedly gotten more reliable since 1980. They last a lot longer.

Unfortunately I don't have the time to do the research and math myself to tease out these relationships.