I had installed one on my 1995 Taurus two days before the caar was retired due to accident. As soon as I got my replacement, a 2002 Taurus 3.0 flex-fuel engine, I ordered the module. Since I installed alomst immediately after acquiring the car I can give an opinion of improvement. But the car feels strong and I'm sure the module helps. Don't know about gas mileage. I've always been tough on mileage on most driving is in the city Installation was a problem. The module sticks out the back of the case where it is installed. This makes the case too long for the space. I was given erroneous information from one technician at Jet to bend a bracket and so wasted over an hour ripping up my hand to straighten the bracket back. Second technician called a local shop for any known issues and said that I should be able to get the original bolts to hold the box in place. I was only able to get one bolt caught and so will be looking for two longer bolts to complete the installation as well as some rubber seal to fill the gap created by the longer module casing. I would do it again but a bit more information on the installation issues would have been nice.