[macbuddy]

After reading this thread, you guys got me so worked up, I had to give this a try myself. Even though I wasn't exactly sure how to go about this, I just went ahead and did what I thought looked right. I used the previous posts as a guide.
About 2 weeks ago, and 4 tanks later (~1,800 miles), I can only report a meager .5 mpg increase. I am not sure if this is due to the warmer weather, or a change in my driving. Regardless, I have not seen any negative effects. With my 13.81 gallon tank, I may have extended my cruising range by 6.5+ miles. I think I am gonna leave these on for now. Hopefully, I will find that these do in fact work to my advantage.