:whs:I call bs on the tornado air management....
along with 95% of the fuel improvement things on the Tv.
if you want better mpg, 3.73 gear's. unless your towing real heavy where mpg doesn't really matter. i average 18mpg with my truck that's hand calculated filler neck to filler neck. 10-15 min highway at 70, and 10-15 min back road 30-45.