I do not know about any of the other MB's, but my 190E 2.3-16 from 1986 has a fuel cut-off when you take your foot off the gas and the throttle closes, at any speed above idle. When the car slows down to the point where the engine idle speed is approached, about 1,000 rpm or so, the fuel is turned back on, in idle mode. You cannot even tell this is going on. The manual shows there are a couple of microswitches to detect throttle position, and there is some other discussion about this feature and how it works. The idea was to improve gas mileage, and I guess it does something for you. I am not sure how this is implemented with an automatic, but I imagine it works the same way. If the engine speed and throttle positions do not require fuel, I see no reason why the fuel cannot be shut off. If you decellerate quicker than you might like, you tip in the throttle a little and the shut off command is negated. As long as the fuel is cut in and out smoothly I see no reason why this can't work with other cars and automatics as well. Good Luck, Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)