Fry's fuel points has a trick to it - it takes $1000 in purchases in ONE CALENDAR MONTH to get the maximum $ 1 per gallon off. if you make say $280 in purchases during a calendar month, the rebate is only 20 cents per gallon and the remaining 80 points are lost. The discount is good for up to 35 gallons, while most cars only have a 14 - 18 gallon tank, and purchasing that much gas would require driving until the tank is empty, and then refilling. Most people refill at a quarter or half a tank, reducing the discount to only about 10 gallons, or only $2.00, or less than 1% of the $280 in purchases.
Discounting gasoline in this way clearly encourages increased consumption of gasoline. Customers who routinely use this discount are encouraged to purchase/ keep gas guzzling SUVs, the reduced cost of fuel makes it less painful to have a gas guzzler, and the large gas tanks in large SUVs and pickups increases the actual amount of the discount.