If an ecliptical running machine says that you burned 1100 calories in 40 minutes how close to accurate is this number?

depends on quality of ecliptical machine,the accuracy of data the user inputs-ie weight,and most importantly-other factors which typically are not entered in the machine such as users age,and body fat%-machines typically use a average for these factors so that they can compute calories burned- having said all that-typically on a commercial gym quality machine- are within 90% accuracy of all users-if your younger and more muscular than average-you will most likey be burning more calories than machine shows.