the way i see it, sport mode basicly makes it open up faster as you push down the skinny pedal. so for example, "stomp all the way down to the floor stock", and there yea go. introduce sport mode, and you will get to that "stomp down to the floor stock" by only pressing the pedal 75% of the way. econo mode is the reverse, making it so you will never get to 100% throttle, thus saving fuel. sounds handy, tho id hate tapping the gas and having the car take off like a bat outta hell
id laugh as my tires squeel.