Originally Posted by Kestas
Conversely, he chuckled anytime somebody tried to drive an automatic like a manual. The automatic picks the best shift points. Just leave it in Drive and go!
Back in the day that WAS funny.
However with modern automatics set at the factory in many cases just for mpg, the "best" shift point - which is different between vehicles, their drivers, and how they are used - isn't available without a tune. Same goes for throttle response.