Quote Originally Posted by Slanter
Here's someone who actually subjected it to a fairly decent test:

The Popular Mechanics Tornado Fuel Saver dyno test article is now available online. While I wish they had more details, the Tornado reduced horsepower and did not improve mileage. It wasn't the most spectacular failure, at least... that would be the ignition device that caught on fire.
Slanter, I don't care who tested it and said it failed. I bought one and installed it, and I'm sure without a doubt that it improved the mpg on a 99' Ford Contour. (3mpg on average or 10%) I drive 92 miles one way to work. A 10% drop in a $250 dollar a month gas bill is very noticeable. Here lately it's not, but when I put it in, gas prices were more stable. I went to a compressed work schedule for a second 10% when gas went to $3.20 a gallon a while back.

And after doing MUCH reading in the past day or so I plan on complimenting that with a number of things from acetone to halo plugs and such. If it bumps my mileage up some more great! Less bills to pay. My take home pay is greatly affected by gas prices so I'm very sensitive to mileage on my car. Since I drive so far I'm OFTEN speeding. I speed in the same areas of the drive every day, the ones least likely to generate me a fat ticket. So I lose quite a bit of my mileage driving part of my trip at 80mph. Anything I can do to get it back up due to that, I'm all for. The namebrand of the one I bought I can't remember but it came from ebay.

So I personally think it 'can' make a difference but you'd just have to try it and see and if it doesn't, well tough luck. That just means the airflow coming into your particular vehicle isn't getting any better with this type of improvemnt, you'll just have to try something different. That's life. You can't put a mud house in a rainforest. In other words different things work in different applications.