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This is something i had to try.
as far as my rig, (auto transmission) coasting in N was not beneficial
test 1, coast to a stoplight in gear
test 2, coast to a stoplight in N
test 3, coast in N, engine on, at 55 on the highway
in test 1, engine dropped to around 400 rpms
in test 2, engine stayed at around 1200 rpms
in test 3, transmission got "confused". the trans started hunting gears with a lot of slipping of the torque converter
so basically i learned to just get my foot completely off the gas as much as possible with the engine still running. when i get to a stoplight i know is going to be long, i put it in N after i come to a complete stop, then turn off the engine.
i'm curious to see how this effects my mpg, hopefully it will help offset the added weight of a trailer, wood, and construction equipment i've been hauling on part of this tank.
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