So apparently it's YMMV at different shell stations re: if the discount is off credit or cash price. I went back to my regular shell yesterdau on mclean ave off the saw mill in yonkers and got the discount off the cash price. Not only that, there is a promotion between shell and stop and shop where you get 10 cpg off per for every $100 you spend, up to $2.20 off per gallon (usable at one fill up), so I did it yesterday and was able to get both the stop and shop and the gift card discount. Regular price was $3.99 and i paid $3.79.