I've heard that many of the machines are inaccurate. I used to have a treadmill that told me I burned 900 calories an hour. My new one says it's just a fraction of that. The amount of calories you burn will be based on your weight, age, gender, and the exercise. We don't know if the treadmill manufacturer programmed it for a 170lb 26 yr old man or a 250lb 40 yr old woman. The difference could be huge. I'd suggest sticking with the FitDay info, since it's based on your own stats.
I do have to admit, though, that when I used my old treadmill, the high number of calories it said I burned motivated me to walk a lot longer. It was exciting watching the total grow.
We have a few calulators
here that might come in handy.