Here is my Ethos test:
The vehicle--91 Dakota 4 cyl/5 speed, 90k miles, owned since new.
Daily driver, 20 mile commute, half freeway half city, always get around 25 mpg on this trip.
Ethos claim #1: increases gas mileage. Well, after 4 fill ups using the prescribed amount of Ethos, I'm getting...25 mpg. Big improvement.
Ethos claim #2: reduces emissions. I didn't want to spend money having the emissions tested, but in looking at the tail pipe the stuff coming out looks the same as always.
Ethos claim #3: cleans the fuel system. When I first started using it I thought the truck idled a bit rougher, now it seems a bit better, perhaps it did clean something.
Conclusion? Waste of money. Not surprising but I just had to try it.
John