7-11 Over charge for new double gulp refills Concord, California

7-11 registers show 53oz refill or larger $1.49 and 53oz or less $1.19. New double gulp cups are NOT 64oz anymore! My children and I did an experiment. We filled a large measuring cup with 8 cups(64oz) of water and filled the old double gulp cup and the fluid barely fit. Then we tried to put all of the water from the old cup into the new double gulp cup and guess what?... it didn't fit. There was still 1/4 of the water left in the cup! We then took a (((competitor's name redacted))) cup, which is clearly marked 52oz and the amount of water was exactly the same.

Made for a great experiment for the kids but when you go to 7-11 for refills twice a day, everyday the calculations come out to about $700.00 a year lost for soda refills for my family. I tried to email 7-11 corporation several times with no response. It seems that as time passes, more and more stores are charging more for the refills. If you want to charge the same amount for the Double gulp refill as you used to, fine! Go ahead, just change  the description in the register so I can't see how you're ripping me off. I will gladly go to (((redacted))) for my refills, as they always have and still charge only $0.99 for a 52oz refill.
 
sorry, allowing you to give a competitors name would instigate others to just file against their competition, to only come back later to suggest their company, ..plus, if you post a competitors name more than likely they will show up on search engines as a Rip-off! - - your comments on this policy are welcome. CLICK here to see why Rip-off Report, as a matter of policy, deleted either a phone number, link or e-mail address from this Report. In this case we removed an alleged competitors name