When I wrote $1.50 I was referring to the $.10 discount per gallon, on my car I usually put in 15 gallons a week = $1.50 savings. I was doing the minimum when in reality we spend about 150-200 a week in food. So if we spent $200, I would see a savings of $3 per tank.
PS I did read and quote the info in my first post where it says maximum $1 off a gallon of gas. Thanks for the vote of confidence for my intelligence and ability to grasp and retain knowledge.