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Old 09-28-2011, 02:31 AM   #1 (permalink)
bbd1254
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Question Is coasting bad on my Automatic transmission?

I drive an automatic 98 pontiac sunfire.
I just recently started hypermiling and just did a 1000 mile round trip from OH to VA and back to see my GF. i averaged a ridiculous 40mpg with the round trip im assuming because of all the down hill i had both ways...(plus i drove like a p*ssy about 90% of the time) the last 200 miles i actually averaged 55mpg..it was ridiculous.

anyways..getting to the point of this thread...
Like i said there were lots of crazy downhill grades, some lasting 9-12miles where i coasted in Neutral literally the whole way, and then shift back into Drive while moving relatively fast so i can slowly build speed to make it up the next hill.

My Question:
Is it bad to shift from D to N and back to D while moving in an Auto Transmission car? i have been told yes and no...

as you can tell i am relativly new to the idea of hypermiling and know very little about cars, altho i wish to learn. dont exactly know where to start...
Thanks in advance

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