Fuzzy Math Part Deux

So you go to Taco Bell. You get a #8 which is 3 soft tacos and a drink(a big drink, but a drink nonetheless). It cost 4.59 plus tax.

3 soft tacos are .99 x 3 = $2.97.
A large drink is 1.69 = 1.69
1.69 + 2.97 = 4.66 which means to get the combo you are saving 8 cents.

However, say your eating in and not drive thru. You can refill a small just as many times as a large.
Small drink is 1.39
1.39+2.97 = 4.36.

It's cheaper to buy separate than the meal deal.

Marketing genius's I tell ya.