downshifting to achieve fuel cut

[GasSavers_James]

do you guys with autos do this? I just started a job driving a chrysler 4cyl with the automatic, delivering flowers. i have been downshifting under situations where i need to slow down anyway to 2nd to achieve the fuel cut. I became aware of this driving a jeep grand cherokee down a mountain in vermont. when i clicked the o/d off mpg jumped up to 99, and when i put it back in o/d, it went down to 45. this is with foot off the gas. so i figure when you dont want momentum its better to encourage the fuel cut. I do this with my vx too, going into different gears depending on how much i want to slow down. I figure the chrysler minivans are built the same as the jeep 4.0 l 6 cyl with auto, in that they fuel cut only above a certain rpm. In fact in the minivan you can feel it i think. it seems to fuel cut above 50 mph no problem, but that is not really that big of a help because aero drag slows you down so quickly that the time spent in fuel cut is short. but on long city decents, you can downshift to 2nd and keep fuel cut for a long time and save the brakes!
anyone else do this? Maybe it creates a little more wear on the tranny, but with this van, it doesnt matter, it will only be on the road another 6 months or so.