I'm feeling cheated

So yesterday I am having some processed luncheon meat (Spam) fried up for breakfast and I notice there are supposed to be 6 servings per can. Depending on how I slice it I get 3, maybe 4. In this case I think they are getting a bit creative because I always thought a serving of meat is 4 ounces and they were using 2 ounces as serving. And how about a pint of Gelato or ice cream? They all say 4 servings per container. After I finish with the third serving there is none left. I want to know who stole the 4th serving! Or do they intentionally leave that one out of the carton? Another one I get to see quite often is a bag of frozen vegetables. They all say 5 or 6 servings. I only seem to get 2 and when I was married with kid I could squeeze 3 tiny servings out of one. And yes, I manage to squeeze by on a bit more than 3,000 calories a day. :-)