Adding Dine In

For those of you who added dine in after you were open, what increase if any did you see by adding it? I am getting ready to go for 1700 sq. ft. of dining room and would like to see if my projected numbers are on par. I am estimating 60 seats with a ticket average of $17.50 and turning each table twice per day. Is this realistic? By the way, I am also adding beer/wine service as well.