I have been meaning to post this for the last week, so I am doing it now.
In my truck, 2008 Nissan Frontier, I have used a number of gas additives. I have used 44K, Techron, Sea Foam, Lucas, and probably a couple of others. I have never seen any improvement in my gas mileage. Understand that my drives to work are very short (~7-8 miles) so I like to try whatever I can to keep the system as clean as I can for maximum mileage, this includes my bike too. Well about a month ago I tried out some of the RPGT. I know that they have high quality products and thought I would give it a try.
The results after the first tank was that I had an increase of 20 miles before I had to put in gas. I have it down pretty good as to when I need to add gas and it is consistently near empty at 290 miles. I also consistently have to add 20 gallons. After adding RPGT I went 310 miles before adding 20 gallons. Before I wrote anything about it I wanted to see if it held true with another tank of gas and it did. I have never had any other of the gas treatments I have used ever do anything at all that I could tell made a difference. The engine is a performance engine so it is hard to tell if it made any difference in the driveability but it does seem to have a tad bit more pep but nothing truly verifiable.
So this stuff seems to be pretty good. I am wondering how it might work on my C10? I do know that I need to clean the carbs and I am going to work on that next spring, but it does have me curious.