Laura I believe all the Sunoco's in the NE region of the US (that's where most of them are, anyway) all did away with Ultra 94 about a year or two ago. I heard from the sunoco franchise owner in my area that it was because of refinery costs. Ultra 94 is still sold in Canada, though. I used to only go to Sunoco because of Ultra 94, but now I use Mobil, as well....
If memory serves me correct, the Sunoco on the Palisades Pkwy right before the exit for the manhattan bound GW Bridge still carries Ultra 94

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