I'm looking to purchase another Tornado gas saver when I stumbled across these reviews. Having purchased one from Autozone about a year ago for my 1995 Toyota Tercel , I have a valid statement. I don't recall if the Tornado was from from TAM or Tornado fuel saver. Did not know there was more than one till today. My Tercel is rated at 33/39 mpg for city/highway. I live in a rural area and drive 110 miles to work and back. This car averages 39.5 mpg carrying 425 lbs (2 people) consistently running Mobil regular. With the Tornado I did not noticed any power increase but mpg went to 42.5. I was quite surprise and my purchase was justified. I'm not one to buy these types of products but gas kept going up so finally I said what the hell and bought one. I wish I would have bought this one a whole lot sooner. The car recently passed smog so no issues there. I'm still a skeptic of  similar devices but this one works on my Tercel. I bought my daughter her first car (2002 Saturn SL) and will put one on her car too. That's my 2 cents.....Ron