Soda calories

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just something I noticed wondering if anyone else has.... Had a large soda from Taco Bell the other day. When it was gone I poured a can of soda in the cup. There was still a lot of ice left. The cup ended up full. So my question is if only one can of soda fills a large cup (including ice) why are the calories so much higher when I log a large soda vs. a can of soda? Yes I know soda is bad for me and I shouldn't drink it. I'm working on it.