After reading this post earlier this week, I made a trip yo Autozone and took advantage of there BOGO and got 4 bottles. When I had originally seen the Valvoline Restore and Protect fuel additive I just thought it would be the same as all the others and was playing off the name. I was wrong, whatever is in it brought my fuel gauge back to life in my dually after B12 Chemtool, Techron, Gumout Multisystem Tune Up and TC-W3 had failed. I bought the truck almost 2 yrs ago now and the front tank never worked other than occasionally (like 3 or 4 x's) coming up between 1/8-1/4 tank when almost empty. The guy i bought it from said that it worked when he pulled it from his truck, tree fell on it, to install it on this one, thought it maybe a ground issue.
We were going camping so I dumped a bottle in my tank to try and clean up any injectors and see if it may help w mileage, havent refilled yet to calculate. While driving yesterday, i just happened to look at the dash and the guage was sitting at 1/2 after 50miles. I was pleasantly surprised as it worked for the next 50 miles and then I switched to the rear tank. It is early to say complete success as I haven't refueled yet but man I hope so. I was about to have the tank dropped and a new one installed.