Fun house

1 tsp = 6 grams
therefore
7 tsp = 42 grams
7.5 tsp = 45 grams

45 grams...what he proclaims is in the soda is one whole tsp more. it's 6.5 not 7.5. therefore, anything after that is invalid since his data is wrong.

he wasn't exactly measuring each spoonfull. He just stuck it in and pulled it out and poured it in he was going by what the scale read each spoonfull.

Where did you find the 1 tsp = 6 grams, and for what substance?

A teaspoon is a measure of volume, not weight, so the weight will vary based on what you are measuring. For example, a teaspoon of lead shavings will weigh a lot more than a teaspoon of sawdust (don't eat either of those!). A teaspoon of salt (I think sugar would be close) weighs about 5 grams, so I think his math is about right. 7.5*5 = 37.5

Here's some more accurate measurements for the amount of sugar in soda:
http://www.fitnessforweightloss.com/how-much-sugar-in-regular-soda/