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Old 12-30-2012, 02:13 PM   #3 (permalink)
Join Date: Oct 2009
Location: Oklahoma City, OK
Posts: 528

ECONORAM - '07 Dodge RAM 1500 QC SLT flex-fuel
90 day: 18.16 mpg (US)

the Avenger - '08 Dodge Avenger SXT
90 day: 27.06 mpg (US)
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I originally thought there was a direct mpg benefit, but after I did some ABA testing on my truck I found I lost about 1% (0.2mpg). However, a grill block does help shorten the warm up cycle, and for my truck, it is letting me get a few more degrees on my warm air intake. And in some (cold) locations, using a grill block is the best way to keep engine temps up...
My grill block (for testing) was basically a flat piece of cardboard covering 80% of the front grill. If you were to change the shape of the front of the vehicle, I am guessing your results could be different, based upon this info at NASA: Shape Effects on Drag
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