Nine swaps were free, and one paid a little back
Rows 2 through 10 share a simple story. The regular and lower-sugar versions sat at the same shelf price in the same size, so the swap cost nothing. That group covers a wide stretch of the store: cola, bottled tea, cranberry juice, a sports drink, gelatin, applesauce, yogurt, coffee creamer and pasta sauce.
The grape jelly at the top went one step further. Welch's reduced-sugar squeeze bottle carried a slightly lower price per ounce than the regular one, and its tablespoon is lighter as well, so each spoonful came out 1.6 cents cheaper while carrying 5 fewer grams of added sugar.
The amounts removed differ a great deal inside this free group, and that is worth a second look. A 12-ounce glass of cola accounts for 39 grams. A tablespoon of creamer accounts for 5, and a half cup of pasta sauce for 4. The price is the same in each case, but the size of the change is not.
A large markup can still be a low cost per gram
Mrs. Butterworth's sugar-free syrup was the most eye-catching price on the list. The bottle is the same 24 ounces as the original, and it cost $7.48 against $3.76, almost exactly double. Yet each two-tablespoon serving removes 22 grams of added sugar, so the extra 15.7 cents spreads thin: about seven-tenths of a cent per gram.
Dr Pepper tells the same story on a smaller scale. Its zero-sugar 2-liter cost 64 cents more than the regular, a 26% premium and the largest among the sodas. Because a 12-ounce glass removes 39 grams, that came to less than a third of a cent per gram.
Sugary drinks, in other words, tend to look inexpensive on this measure even when the shelf tag looks steep. If drinks are where most of your comparing happens, our breakdown of chocolate milk, sports drinks and protein shakes prices that aisle from another angle.
A small markup can be a high cost per gram
The peanut butters show the reverse. Jif's no-added-sugar jar cost 14 cents more than the regular jar and is half an ounce smaller, which works out to 1.8 cents more per serving, an 8% premium that most shoppers would barely register. But regular creamy peanut butter has only 2 grams of added sugar per serving to begin with. Dividing a small premium by a very small reduction put Jif 24th of 25, just behind a chocolate syrup with a 63% markup.
Skippy landed far higher in the ranking for one reason: its two jars were the same price, and only a 0.3-ounce difference in jar size separated them. The sugar removed is identical, 2 grams per serving.
Ketchup sits in similar territory. A tablespoon of regular Heinz has 4 grams of added sugar, so a 3.2-cent premium per tablespoon comes to about eight-tenths of a cent per gram.
The one pair above a cent
Werther's sugar-free hard candies were the only product to cross one cent per gram, at 2.3 cents. Two things stack up here. The sugar-free bag is smaller, 7.7 ounces against 12, and it costs more, $6.94 against $5.44. Per 16-gram serving, that is 50.9 cents against 25.6 cents for 11 grams of added sugar removed.