My bet is that the machine itself uses about the same amount of energy as is being saved by recycling the plastic bottles in the first place. I grew up outside Boston and my small home town did not have a dump, but rather a transfer station. Newspaper had to be separated from magazines, clear glass from brown glass from green glass, wood and metals, different types of plastic were all put into separate dumpsters by you. There was no trash pick up, you hauled everything to the Transfer station yourself. There was and still is a large shed called "The Swap Shop" where you put anything that might still have value. You could take anything you wanted from the shop.
I now live in Utah where you have to pay for your own recycling. If you take stuff to the dump it all goes in one big pile. They do like you to separate out your metals, but that is mainly so the guys that work there can take the copper and Aluminum to the recycling place and keep the money. I took three aluminum rims out one time and they weren't happy. Dropped them off myself for $40 in cash. I took a two person bike one time and they raised such a fuss that I finally just paid the guy $20 and then he was fine.
The problem with recycling is that there are endless opportunities for gathering the recycled goods, but few products that can legally or profitably be made with them. The quality of the finished product with recycled plastic is often less than with virgin material. The way things are manufactured with injection molding and blow molding often does not lend itself to using recycled plastic. My bet is that the 10% recycled plastic that Pepsi is using in their bottles is not post consumer waste. Most of the time is manufacturing waste. I could be wrong. Without very careful sorting, whole batches of recycled plastic can be ruined because something "different" got into it.
If you want to make a difference in recycling, support or develop products that can utilize post consumer goods. There is a kid from BYU that has come up with some really neat stuff dealing with old tire. They have put glass into pavement. There is a guy in Northern Utah that takes any type of plastic and is able to fuse the shredded parts into pallets, railroad ties, trash can wheels.... There is some neat stuff out there, but it needs to be supported and developed.