HFCS comes in varying F/G ratios. HFCS-55 is the most common, which is 55% fructose. The other two common varieties are HFCS-90 and HFCS-42. All HFCS starts at 90 then pure glucose corn syrup is added to dilute it down. HFCS-55 is about as sweet as sugar (unless heated, in which case it it significantly less so).