Not for everyone. Me I use PC gas bar where I get 3% and 7c/L off, which is a better deal. The 25$ is for 500L. The 200$ gift card will barely get you 200L depending where you live. The other 300L is regular price with only 5c discount.
So for me it's a pass. A straight 225 gift card for 190$ would've been maybe worth it (about 12% vs 10% with PC)