I'm used to driving a manual, which means I'm used to always knowing the exact amount of power my car will give me, because I know which gear I'm in. I had a loaner car for a while with an automatic box. After a while I put it into sports mode, because in that way i'd never be underpowered if I needed to get in front of somebody. I would usually turn it off on freeways, but the damage in efficiency would already be done.