Pretty good debunking on all of the fuel economy gadgets out there. Popular Mechanics has been doing a lot of this lately and seem to be getting damn good at it.

http://www.popularmechanics.com/auto...o/4310717.html

 

It's been a while since one of those Brown's gas guys said they were going to put one of these on an 8 and get 30% better mileage They always turn out to be full of, well, brown gas when asked to post numbers.

 

i like how in the article he says " i get letters that say" you did x wrong or you are a shill etc and then one of the on line responses is exactly that