I think I'd have to disagree with you on freewheeling - correct don't use the brakes, because you have wasted the energy getting there, just use natural engine braking. Also when freewheeling the engine will use fuel to turn the engine over and keep firing, however, keep it in gear going downhill, just take you foot off the accelerator - the momentum keeps the engine turning ie use gravity to power the engine not petrol
I am no mechanic/engineer - so feel free to shoot me down
Hmmm. you learn something new every day.
What I found with the golf was that under engine braking the car would slow down quicker, whereas if free wheeling, you could happily freewheel for a much greater distance - so if i saw cars braking up ahead of me on the road I could just time it so id freewheel up to them, whereas with engine braking, the car would end up stopping too soon, and id have to accelerate again. You can cover quite a long distance sometimes through freewheeling, esp if down hill - so in effect you could be travelling at 60mph, but engine revs are just idling at 600rpm - compared to whatever revs you`d normally be pulling travelling at 60mph. I know on my golf it made a huge difference, but maybe on the zed things are different.
As someone else said, at any rate, the zed isnt the car to have if your worried about saving a few mpg!
Think diesels run a higher compression than petrol so have greater engine braking!