For every $1000 spent on gas at Esso stations, you would get every 10000 PC points. [You would get 10 points for every 1 dollar spent]. For every 10000 points, you can redeem $10. So for every $1000 you spent on gas, you are going to get $10 back.

Thus the ratio of earning cash back: 1%.

For every $1000 spent on gas at Esso stations, you would get every 1000 Esso Extra Reward points. [You would get 1 point or more for every 1 dollar spent]. For every 1800 points, you can redeem $10. So for every $1800 you spent on gas, you are going to get $10 back.

Thus the ratio of earning cash bask: 0.56%

The Winner is