2 products
Fiber One appears in our catalog with 2 published products. Across the 2 items with reported nutrition data, average added sugar is 6.0g per serving.
The lowest-sugar pick is Fibre One 90 -Chocolate Fudge Brownies at 3.47g (Tier D); the highest is Oui by Yoplait Chocolate Peppermint Yogurt at 8.5g (Tier E).

Fiber One
Fibre One 90 -Chocolate Fudge Brownies

General Mills
Oui by Yoplait Chocolate Peppermint Yogurt