Bought Ethos to improve gas mileage and decrease car pollution. Also as part of their attraction was to pay them $5 and receive gas vouchers. These were to be redeemed along with $100 in gas receipts of one particular gas brand per month. I was to receive a $25 gift card for each month's redemptions for a total of$100 plus my $5 back. No gift card ever came, and the next batch of vouchers were returned to me. The address in Largo, FL was no good. The 1-800 number was also not valid. read full review »