In mcdonalds a rumour is going around about the large cup has the same amount of liquid as a medium cup is this true?

Question: In mcdonalds a rumour is going around about the large cup has the same amount of liquid as a medium cup is this true?
- Keywords:
  liquid,
  Mcdonalds
Asked by HAMMY to Deborah, Euan, Maheen, Rob, Stu on 15 Jun 2016.
- Maheen Siddiqui answered on 15 Jun 2016:
  
  Oooooh I haven’t heard that one! Quite the scandal if you ask me!
- Rob Stanley answered on 15 Jun 2016:
  
  The best way to test this is with science – do an experiment. Buy one of both, drink the medium, and see if all the liquid from the large one will fit inside the medium cup.
  
  My prediction is that they would be different sizes – there are lots of rules about how companies are allowed to sell things, and if you found out they were the same size you could make a complaint!

Question: In mcdonalds a rumour is going around about the large cup has the same amount of liquid as a medium cup is this true?