I go to starbucks about twice a day, and I ask for a regular venti coffee, with a little bit of non fat milk and I use splenda. So the calories for that would just be basically from the milk right?
Coffee does have calories - I think it is 4 per cup, so you are probably getting around 12 calories in the venti. You can burn that just lifting the cup to your mouth
Splenda is 4 calories per packet, so depends on how many of those you add.