I followed all the directions and the pillow still shrunk and became too small to use. Couldn't really determined if it worked or not.

This product works great if used correctly. I have a 1996 Lexus SC400 and it solved my catalytic converter problem. I have also seen a 10% improvement in fuel economy over several tanks. I believe that the key to having success with this product is actually knowing how much fuel is in your tank when that light goes off. You need to know how much fuel the fuel filler neck holds as well. For example, my 2003 Chrysler Town and Country has a 20 gallon tank, but the fuel filler line holds another 1.5 gallons. When the fuel light comes on and I refill I typically put in 16.5 gallons. Thus, the tank really had 5 gallons left in it. Just keep that in mind when using this product. However as an engineer I'm impressed with the results. Even if this is something I do every year, the fuel savings and improvement in engine response are worth the effort.

We encountered this brand on a vacation, it was the Hilton hotel free brand. We absolutely loved it! And since we are Amazon fans we searched for it here and Fab products had the best price. It was pachaged well and delivered on time.