What is it?

1:12 pm Autos

I have been doing a lot of research on gas and how to get the best gas mileage for your car. Apart from going to a hybrid car which I can not afford right now, I am doing whatever I can to save on gas. There is an abundance of materials and products on the internet that claim they can offer what I am looking for but I do not know what half of the stuff is on the market. Ethos sounds like a great supplement for the car but I can not find out exactly what it is and the long term effects.