Silvey01, I'm glad to see you're getting better mileage. However, the fact of the matter really is that we have some great knowledgable users here that really do know a lot about engines and how they work, especially when related to efficiency. You can ignore these users, but it really isn't going to get you better mileage. There are a lot of misconceptions out there, and many are wildly proliferated via the internet and car forums. We do a lot of testing here to prove our modifications work (or don't work) which is pretty rare.
That being said, this modification is not responsible for getting you your extra 1 mpg. I would highly recommend looking over the
65+ mods list for staring out ecomodding. Its a very good list. The mods listed are
proven modifications that do work.