Eco OBD OBD-Ⅱ Economy Fuel Saver, Chip Tuning Box Reader Diagnostic Scan Tool Scanner, for Petrol Car Cost Saving (3Pcs)

I bought these to try them out. I have gained 5 mpg in my truck, now enjoying 25 mpg. I will be giving these out at Christmas time. I love mine.

I have followed the directions on the package... with all 3 that I recived... all three do the same thing... I placed it in the OBD port... put the key in and turned it to the accessories point/first stop... hald the reset button... (by the way the directions do not tell you where it is!) It's a little hole in the front or pop the cover off and press it... for 5 seconds... it goes orange... then all three go back to flashing green and orange... turn vehicle on ran 1 over 150miles never stopped flashing green orange green orange... even with the truck off and the key out of the ignition it never stops flashing... so I belive I will return said j nk...

Great

Was a total rip off

I received the item item would not pair to my car so it didn't work so I go to return it and it cost me it cost me just about as much to return it as I paid for it so what's the sense

These work very well has lifted economy many times 10 miles per gallon . Very happy with it.

Don’t work

I tried this on my standard trans 2008 Toyota Yaris and it did not change the mpg at all and May have decreased by 1mpg. However, on my wife’s 2013 Nissan Rogue, I noticed a 7mpg increase after a day or two. Definitely will pay for itself…..