On Fri, 25 Apr 2008 19:13:03 -0500, Paul <Paul@[EMAIL PROTECTED]
>
wrote:
>Some mpg savings is to be expected.
>You have eliminated the rolling low pressure drag zone in the bed and
>created a boundary layer.
>The worst thing you can do is drive with the tailgate down, or off, or
>with one of those air gate things.
>However, to accurately determine the mpg, you will have to fill up the
tank.
>"About" 1/8 tank is not good enough. Your gas gauge is not linear,
either.
There are some detailed studies you can read on this... the cover
would generally help, but you can get people to argue both sides.
Depending on driving speeds, styles\, and conditions, you could find
better results in a lot of different ways (same as other changes to a
vehicle).
Bottom line is that what counts is whether _your_ mileage improves.
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