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As I noted from the scangague, the civic auto will burn ~.25GPH in neutral, but if coasting in gear over 15mph, the wheels will keep the engine pumping while burning .00GPH... but there will be drag from the engine which will cause some deceleration compared to neutral.
I've decided it cancels out either way, since at the bottom of the hill in gear you'd have to use a little more fuel to get back to the speed you'd have been if coasting in neutral, but you have not had to bother with shifting, etc.
With that said, I'd like to know if anyone has an idea rule of thumb for when to sometimes use neutral in an auto and when to not bother.
The Honda auto will return to the proper gear when going from N to D, from what I've seen.
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