Comment by llm_nerd

>High fructose corn syrup is 55% fructose.

HFCS is from 42% - 55% fructose (the glucose obviously filling the remainder). Many uses are on the lower end.

A lot of people think the "high fructose" part of the name is relative to sucrose's 50:50. In reality it's relative to corn syrup which is almost entirely glucose, but some of the glucose can be processed to fructose to more closely match the sucrose that people are accustomed to. They go a little higher on the fructose because it is perceived as sweeter, so with a 55% ratio they can use less for the same sweetness.