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Mine's always UP...I used to have an S-10 in H.S., when it was down I got a lot of rock chips in it...now that I have something more expensive and nicer, I am more worried about rock chips then gas milage...but I did do "my own little study", and I think I only got about 10 more miles with it down, its been up ever since!
The owners manual for my 94 specifically advises AGAINST driving with the tailgate down due to the possibility of it falling off the truck when driving over a bump. This could prove to be very exciting on, say, an interstate freeway at 70MPH. For this reason as well as to make sure I don't get sued by a lawyer for not following the manufactures instructions, I keep it up unless I'm hauling something long and heavy. Just my 2 cents worth.
There was an article in Consumers Report Magazine a few years ago on this subject. The article stated that at 60 mph a large ball of air would form in the cargo bed and that the new air coming in at 60 mph or more would hit it and deflect over the tailgate. No gas mileage advantage would then be gained by using net tailgate or leaving the tailgate down.
I got a fiberglass Lear cargo cover installed and it's a lot better
for snow covered area like here in Montréal Canada
Nannok2003
1994 Ranger SC 4.0L 4X4 3.73 P265 tires
300,000 Klm (180,000 miles) and still running.....
Hello Flexfuel-Dave,
This question is to ponder the thought of the local-yokels / big brother in your area! Of course leaving the tailgate down creates less wind drag in the cargo bed... and there is drag or your stuff wouldn't fly out all over the road behind you. Taking the tailgate off when not hauling cargo would be the best bet. Aerodynamically, leaving it down is a bad idea cause the wind pressure that is created, needs to be there at higher speeds cause of the lightness in the rear of a pickup. Went into detail hope this remedies questions in the various threads that I have read on the subject: tailgate up / down.
Don't any of you watch cable? The Mythbusters did a bit on this subject. 2 identical trucks, only accelerating with the cruise control. The gate up truck went 30 miles further before it ran out of gas! They did some scale model testing in water, and you could see the turbulence with the gate down. Funny thing was, they got the BEST mileage with one of those rear nets and tailgate off!
I've also known of other drivers coming up too close behind and accidently tapping the gate especially in parking lots when it's left down. That will knock the tailgate out of line very easily.