Well!!! snake oil is a common term on another forum describing this stuff as well!! Truth is I`ve used it for 7 tanks in my 01 E-350 5.4 ,loaded w/tools all the time & most miles are around town miles= before using it=10.2 mpg,,,,,, 1st tank using it 11.5 mpg, 2nd tank=12.2 mpg & now getting 13.4 mpg...

call it a fluke,snake oil, hokey pokey ,whatever !!!!!!!!!!!!!!I`m getting 25-30% better mpg now than over the last 7 yrs & with the cost of fuel I`ll continue to use it ( just took delivery of a gallon )
The key for some users is to reset there computers default settings after putting it in by disconecting the battery & leaving it disconected for a few hours ?? I did not have to do this but the ethos forum I`ve visited a few times has the proper usage info.

So, take it or leave it !!!!!! I`m taking it and saving $$$$$$$$ using it.


Fixin to try it out in my 08 f-350 diesel!!!