I'll have to find a magazine article that I read not too long ago that reviewed (with dyno sheets) several 'mileage improvers'.

When I find it, I'll scan it in and let everyone read through it. They stated that it was flimsy and made NO improvement in any way. I can't remember what magazine it was exactly, but the ones I get are Popular Science, Super Chevy, Chevy High Performance, Car and Driver, and Motor Trend. Take your pick, but they are all highly reputable sources.

 

Consumer reports just did a article on mileage improvers. It didn't find a single product that improved mileage, most actually reduced it.


My stock 99 auto, 4 door, 4wd got 25 mpg on a 100 mile trip once, oh and thats with 176,000 miles.