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In addition to Mythbusters killing the tailgate down theory (I love Mythbusters), the National Research Council Canada (NRCC) showed that leaving the tailgate down or removed made wind resistance worse (5%) on trucks with the short beds and made little to no difference on trucks with long beds. So, leave the tailgate up and convince your buddy he needs to drop his. Maybe that's the advantage you need. LOL

http://www.nrc-cnrc.gc.ca/highlights/2007/0705uplands_e.html
 

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i lost by two truck lengths but this was like a month ago i raced him again like 4 days ago and he beet me again but i was right next to him at the end im thinking about buying the 07 tahoe stock rims
Hey! I'm looking to replace my 08 Tahoe stock rims with aftermarket. Let me know. Maybe we can do some wheeling and dealing. :money:
 

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They re-tested it because of veiwer complaints and it turned out that tailgate down was more efficient.
I must've missed that episode. When did you see that? I found that they revisited the tailgate down theory (http://kwc.org/mythbusters/2006/12/episode_64_more_myths_revisite.html) but only because the viewers suggested they test one with a hard bed cover, a mesh tailgate and one with the tailgate removed altogether. The tailgate up was proven again more efficient then tailgate down. Either way, you can't dispute wind tunnel testing (see http://www.nrc-cnrc.gc.ca/highlights/2007/0705uplands_e.html) and the test proved there was more drag with the tailgate down.
 
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