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Old 01-08-2013, 04:21 AM   #12 (permalink)
wmjinman
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Join Date: Oct 2012
Location: Carson City, Nevada
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Jimmy - '00 GMC Jimmy SLT
90 day: 21.18 mpg (US)

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Quote:
Originally Posted by NeilBlanchard View Post
The Riviera is heavy and it has relatively low drag; if I am remembering the right model.
Yes, it's the "generation 8", made from '95 to '99, and I believe they're around 4000 lbs. and have a Cd of .31 or so. I suppose that is a good combination for extra-long coasts.

And I think Old Mechanic is right about the torque converter completely "un-locking" during a power-off coast, too .... I have shifted between "neutral" and "drive" while coasting without being able to detect any difference at all.
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