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Originally Posted by htvfd460
What is the average coast down speed on a steep long grade hill?
I am trying to figure a general rule of thumb.
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There isn't one.
It depends on the angle, on your vehicle weight, the aerodynamics of the vehicle, even the road surface.
When the aero and rolling drag equals the pull of gravity, the car will reach its terminal velocity.
I need around 5% gradient to maintain about 60 mph
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For example going down a mountain hill in neutral my truck would stop acelerating at 65 mph, After dropping my truck its gone up to over 80mph in Neutral coasting.
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Dropping, as in lowering the truck's ride height ?
That's a known drag reducing measure, so it's clear it reduced drag on your vehicle, and made it coast down faster until it reached its new equilibrium at over 80mph.
It's a serious increase in speed though.
Have you noticed a reduction in fuel consumption since dropping it ?