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I don't know, but I think its just the AMC 4.0L Engine in my Jeep. Coasting in neutral hasn't helped my mileage at all, it seems I get better MPG's coasting in drive. and at higher speeds my tranny shifts back into drive hard.
Now putting it in neutral when coming to a red light or when the light is red HAS helped.
It all depends on your ecu and what happens at higher speeds. My car coasts slightly better in drive in my Jeep. I think this is what happens:
-ECU uses same amount of fuel coasting in drive or neutral
-neutral, car uses idle fuel amount, but its not pushing any of the power to wheels
-drive, car uses idle fuel amount, but that fuel is actually being used to power wheels
-drive gets the added push from the wheels, which actually lowers resistance.
My technique:
Coast down to speed in drive, and once I hit about 15 while slowing down, I whip into neutral and come to the stoplight in neutral.
Thats saved me more in gas than neutral coasting all the time. Now thats just my Jeep. Totally different than other vehicles. This goes off tank to tank only, no instrumentation (I got a vacuum guage once, it was crap and I sent it back for a replacement... never got one back).
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