p90x

Will you see results with p90x? Yes, particularly early on.
Will it be the most efficient way to see results? No.
Is it an ideal program for sparing muscle mass and losing fat in a deficit? No, you'll work your *kitten* off for sub-optimal results.

I hate to call anyone out but this is the exact opposite of the truth. First, you won't see great results early on. The program is designed where you will see the greatest improvements in the last phase. Second, it is by far one of the most efficient ways to get in shape. No time spent traveling to the gym, you work all of your muscles, and you get it all in 90 days! Third, P90X will help you build muscle mass which in return you lose fat. A lot of diets out there have you burning all of your muscle to get "lose weight" but we all know that isn't healthy and it leads to gaining it back because you aren't happy with how you look. I don't know if you have ever done P90X but if you haven't, please don't post false information. Thanks!

I'm very familiar with the program. I wouldn't have commented on it if I was not. I'm all for programs that force people to get up and be active, and yes there are relatively worse programs one can do.
With that being said, I stand by what I said. P90x lacks the high tension muscle stimulus required to preserve LBM in a deficit. This is not as big of a deal for someone significantly overfat, but the OP looks relatively lean. Your post is full of mistaken assumptions and generalizations which are not always true.

You said, "P90x lacks the high tension muscle stimulus required to preserve LBM in a deficit." Have you not seen the results??? I have gone from well over 20% body fat to 10% body fat currently (and should be down to 8% by the end of this round). If P90X lacks the high tension muscle stimulus then how did that happen for me? I was not trying to assume anything in my post, but this kind of information is just wrong haha. I have gone from a keg to a six pack P90X rocks but you are entitled to your opinion.

I did P90X last summer and saw little results. However, I did not follow the diet plan. I logged my meals here on myfitnesspal. I did notice I appeared leaner but weight more. SInce then my weight is varying between 1 to 3 pounds. I think I'm going to try P90X again with some modifications. My shoulders were way too bulky. I love how lean my legs were. I found that I lost more weight doing Jillian Michaels 30 Day shred. I also start doing Zumba which it really help trim my waist. Now I'm trying train like a contender. I notice some results from there as well. I guess you have to find what works best for your body. I'm sure eating right has more to do with my results. I tend to overeat on the weekends.

The second round, I followed the plan exactly, had a Beachbody coach that I reported to weekly for advice and tips, and gave up caffeine and alcohol. I did it the right way, to see if it made a difference. It did.