Indeed, the smart diesel doesn't use fuel when coasting... !!!
...which more than makes up for for not putting in an auto-stop or kill switch, which isn't really a good idea on a turbo'd diesel, as you want the turbo to cool down before shutting the engine off.
I do turn the engine off after 15 seconds of being stopped, as long as I have 15 seconds more before I need to go - like when there is a train obviously.
You guys just wait til I get my skinnies back on the car and boost the PSI...