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Brick walls actually glide a lot better than you'd think... the problem is it takes a lot of fuel to regain the speed after you've lost it.
Barn doors glide poorly, but you use less fuel on the pulse.
With the comments about vehicles being "underpowered", I have to ask if you are trolling. If you aren't, I'd ask if you consider a semi-trailer to be "underpowered", and your reasoning behind that.
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"Every body perseveres in its state of being at rest or of moving uniformly straight forward, except insofar as it is compelled to change its state by force impressed." - Isaac Newton
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