why does soda at restaurants' taste so much better than the soda inside cans?

There are a couple of possible reasons. The soda in cans has had a chance to pick up flavors from the plastic that they spray on the inside of the can and the canned sodas have been sitting around long enough for chemical reactions to occur that can change the flavor. A restaurant not only makes the sodas at the time of service but they are also able to adjust the amount of syrup in the soda to the taste of their patrons.
 
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