funny, my dh says the DDE is there to cover the tip..
which is what we did 99% of time.. we absolutely calculated tip prior to discount.
think only one time we only gave 15% which in my opinion, server deserved nothing..
never brought soft drinks, served us dinner then came appetizer,never refilled our childrens drinks and to top it off, we had no silverware until 5 minutes after entree served
think it was his first day on job