I've been using this recipe quite some time, I think I cut it out of a newspaper. I use 4 cups cooked potatoes, 1 cup mayo, 2-3 TB vinegar, and 2 hard boiled eggs, chopped. Everything else is the same. This is a very good recipe.
This recipe rocks - I used it for our Oktoberfest Party last year and plan to do so again this year! It was quite a hit and all 80 cups went. Good when you have vegetarian friends too!