Irn Bru has 65 calories and 16 grams of sugar in a 11.15 oz serving.
Learn more at https://www.agbarr.co.uk/our-brands/irn-bru/
Mountain Dew has 170 calories and 46 grams of sugar in a 12 oz serving.
Learn more at https://www.pepsicobeveragefacts.com/Home/Product?formula=44316*01*01-10&form=RTD&size=12