OK Im only on page 5 and Im going to go ahead and throw in my 2 cents.
I started running an HHO Cell.. Single Cell with the o2 sensor wrapped method. I didnt get to much increase, remade the kits etc, installed another and I got a better increase, my idle is a little rough at times sitting in traffic. Still wasnt happy, so i made a freaking HUGE one, we are talking a gallon specific jar, with my method and a few others. At this time, with the one lil one, and the big one, I was getting 75 miles on a 5 gallons, I now get roughly 100-105 miles on 5 gallons! What kit did I use, just search for the best one for your SUV or whatever your putting it on. There is two or three different ones, hell i keep upgrading mine. I am one of them that is going to install the "efie" or o2 manip, after i find out what is the sending wire. Hey, I just even saw a commercial on tv.. that BMW is now running hydrogen cars.
Also everyone was like, you know why isnt this OEM, well most of the explorers ive helped with and mine are OLD, well in 1993 we didnt need to find something to help with gas prices, at that time, our MPG in a 1993 was decent, now its crappy and all the "snake oils" are coming out of the wood work.
You get brown water from burning the baking soda in the distilled water, the baking soda is added as just an enhancer to make more HHO.
Again im only on page 5 so ill ad more soon.