So I was bored and just reading about the TAG. Not a believer. Anybody have one? and did it increase 1-4 mpg while towing like it says? I think most of these aftermarket gimmicks are hilarious. I get a kick out of these people that say I just installed Brand A, air filter and gained 3 mpg. Sorry fellas but I am a sceptic about people's mpg claims. I know a lot of people who drive these trucks for a living and know what they get for mileage. Anybody claiming much over 21-22 at most, save your fingers some typing! Love reading the posts--Just got 28 mpg drivin through Big Hillbilly Mountain Pass...etc. What is your biggest aftermarket gimmick disappointment? BTW, I did not start this thread to bash any vendors or start any arguments. Remember, I gained 6.8 mpg with my "Bad To The Bone" bumper sticker. I just didn't put it in my sig becuz I don't want to make anyone jealous. J/K. Thanks.