Thank you all for the reply. I feel stupid for thinking the tailgate down was better for airflow but I cannot dispute an official study. Today my tailgate goes back up. I even tried driving around with it off the truck. It is near time to take a second mortgage on my house and fill the tank up on the ole Silverado so will do another mpg check at the end of the next tank full. Should be interesting. Thanks again for the help gentlemen, John. Dont know what gas prices are in other parts of the country but here in middle Tenn it is $3.59 per gal on average. When is our "government" going to get wise?
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