Winter mode causes the car to start in third gear. Helpful on
ice. The car will feel like a slug if it is working.

Sport mode causes the tranny to hold the shift points a bit longer.
You can notice the difference at partial throttle by paying close
attention to the shift points. (You do need to wait til the car is warmed
up since the shift points are held a bit high when the engine is cold
to speed warmup.)

If you floor it, the sport and econo mode both hold shifts til redline
so flooring it won't cause you to see any difference.