eco obd2 tuning chip - $20 (Piqua, OH)

i have (2) eco obd2 tuning chips for increased fuel mileage, mistakenly ordered 3, only needed 1 the one in my truck has shown me improved fuel mileage been in the vehicle 2 weeks now, simply plugs into the obd plug.
cost me 30.
00 apiece, my stupidity your gain !will sell for 20,00 apiece 2yr.
warranty !