Question???

Your best measuring device for calorie burn is a HRM. Everyone will agree. I never use the eliptical, but have heard others say that the eliptical always seems to double the amount of calories compared to their HRM. Don't trust it.

I don't eat back the calories, but that works for me. If eating them back works for you, stick to it!

I wear a heart rate monitor when I workout so I dont rely on the machines to tell me how many calories I am burning. Also MFP is way off as far as calories burned too, so the most reliable source is going to a HRM.

As far as eating exercise calories, there is no way that I could eat back ALL of exercise calories. With my workouts, MFP is telling me I need to eat 2700-3200 calories. I usually stay between 2100-2300 calories at the end of the day. I eat every 2.5-3 hours. For me personally, I would rather know that I could eat more food and still lose weight than try and starve myself by eating only 1200 calories per day. I cant imagine eating that little calories. I would be starving. But that is just me.

I'd also go with the lower number. Obviously it depends on your personal stats but I know for me I burn (very roughly) 100 cals in 10mins when I'm exercising hard enough to work up a bit of a sweat (that's from my HRM).

As for eating the exercise cals - I didn't to start with and lost steadily, hit a plateau for about a month and only got out of it when I started eating back 80% + of my exercise cals. It would seem for me that my net calorie intake was way too low to sustain my daily activities and exercise, but it kickstarted the weight loss nicely once I started eating more. I also feel better - more energy etc.
But if it's working, then I wouldn't bother changing anything, just be aware that it may well help if you slow down.

Also lots of people seem to say that eating the same amount of cals daily, and the same exercise can sometimes slow your loss as your body gets used to what you are putting it through. Some people make a point of zig-zagging calorie intake over the week and mixing in different work out routines.

Go with the lower number - it just sounds about right.

That's what I do. I wear a heart monitor, track on the machine, and then compare all three (including what MFP estimates) and go with the one with the lowest cals burned.
Also, I am an exorcise calorie eater. I have more energy to weight train, for cardio and just in general when I eat them back. I start at 1200, most days I burn between 600 and 800 (except leg day, then it's closer to 1200) but when the day is over, after all meals and exorcise, I am still right around 1200 netted calories for the day. I wouldn't be able to get through a workout if I ate any less.
When you hit that plateau....change your routine. Increase the resistance, or weight. Do more intense workouts. That should give your body a little kickstart. My husband and I have also learned that a short rest period also confuses your body into getting back on track. Every couple of months, we take a week off from the gym. When we go back, we have more energy, lift more weight, etc. By no means is this week an excuse for us to go buck wild, we still maintain a healthy diet.
I hope my rambling helps!

Go with the lower number - it just sounds about right.

That's what I do. I wear a heart monitor, track on the machine, and then compare all three (including what MFP estimates) and go with the one with the lowest cals burned.
Also, I am an exorcise calorie eater. I have more energy to weight train, for cardio and just in general when I eat them back. I start at 1200, most days I burn between 600 and 800 (except leg day, then it's closer to 1200) but when the day is over, after all meals and exorcise, I am still right around 1200 netted calories for the day. I wouldn't be able to get through a workout if I ate any less.
When you hit that plateau....change your routine. Increase the resistance, or weight. Do more intense workouts. That should give your body a little kickstart. My husband and I have also learned that a short rest period also confuses your body into getting back on track. Every couple of months, we take a week off from the gym. When we go back, we have more energy, lift more weight, etc. By no means is this week an excuse for us to go buck wild, we still maintain a healthy diet.
I hope my rambling helps!

Right now I am struggling if I should be working out everyday as I have been or not. It seems to be working for me and I am not sore but I have read that its bad to work out everyday because you lose muscle mass.. what do you think??

I workout 6 days each week, and I stick with what produces results - not what some theorize might happen.
It sounds like you're getting results, so keep punching!

I change up my specific exercises every few weeks as well just to stay ahead of my body's attempt to make life too easy.