It’s not just the business case. A manual car isn’t as simple as it seems. The manual transmission is a simple device. Take this 1936 GM educational video on how they work; All the basics ...
In our tests, we've found that in some cars a manual transmission can improve gas mileage by a significant 2 to 5 mpg, compared with an automatic, and can cut a car's price by $800 to $1,200.