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Do not put tailgate down to save gas...
tail gate down. THIS IS NOT GOOD, CAN WEAKEN
HINGES, also there is no MPG improvement, you
aeronautical and engineering buffs would know
this. A Vortex is created at rear of cab,
trapping the air.
A toneau cover will do the trick.
TO ALL TAILGATERS: Stop using your tailgates to
save gas. If you claim you are getting better
MPG, recheck your math.....