Rolling down a hill, round corners and rolling to save gas with your foot on the clutch is an extremely bad habbit to get into. I for one have wasted alot more money than I've saved from this practice...why???? when I was young and stupid I was a believer that 'coasting' was a great way to save petrol, until I tryed coasting through a corner a little to quick and smashed through a metal fence!!!
Normaly I could hit the corner alot quicker when I was driving in gear, but with no engine control I just slid straight off the road. So I learnt the hard way that you need to apply the engine to pull/push you through a corner properly, and especialy with a front wheel drive, how you apply power will determine if you under steer or over steer. I sugest you slowly learn your car in a very quiet area where you can feel the difference between coasting and where/when you apply power through a corner. Do it with someone who has some idea of your car (fwd, 4wd, rwd,)who can help and give pointers because the ealrier you know it, the more cash you will save.