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van type vehicles do not suffer separation as notchback or fastback cars and consequently do not generate lift as the other cars do,so spoilers are of no value unless perhaps you were driving at extra-legal speed on wet roads.
As far as drag reduction,I've never seen a test in which a spoiler helped.
The xB is a 'full-wake' vehicle.It's wake is as large as it's frontal area,as there is little if any roof or body sides camber.
It's my opinion that only something like a boat tail extension would give measurable relief at the pump.
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