Fuelbox, Fuel saving device

Anyone ever heard of this before? I just saw a Facebook post about this. It’s another “plug into your OBD port and save 15% on fuel” device. I’ve seen a lot of these claims before and none of them have turned out to be true. (Although I guess I've never tried one before.)

https://en.aafuel.com/?fbclid=IwAR1LXMJBS166aNCCcjTZUMoRZ5bWEEaoQDZhAg3mZz1FVf1zn7MytQPz_pc

Now before you go off half cocked...
No, I'm not wasting my money on this.
No I don't believe it can do what it claims.
I just want to know if anyone else has heard of it before, and what they know about it.

 

Never heard of this but then I really don`t look for things like this .

Interesting it can work with every vehicle with a OBII system

 

If it does work, it's going to take a lot of your power away. It can't be a black magic box.

 

For the most part that crap doesn’t work. If they did the manufacturers would be using them to get better fuel mileage.