KFC stores are individually-owned franchises, and there are no national Tuesday specials consistent across the entire chain. Each restaurant sets its own local promotions independently of other KFC locations.
The only deals offered through KFC's corporate site are through its Colonel's Club loyalty card. Members receive special offers and coupons via e-mail. These deals are not posted to the company website and can only be viewed through these e-mails.
Offer.com lists specials for KFC, but none of the verified offers are Tuesday specials. This list contains items with low regular menu prices, national promotions that are valid every day and information about joining the Colonel's Club for discounts.