The most recent MacBook I have is an early 2013 15" with Retina Display, and when installing Windows, if of course uses CSM/BIOS rather than EFI, and has the poor battery life and heat that comes along with it. I owned a MacBook Air for a while that I believe was the first model that installed Windows 8.1 in BootCamp and used EFI automatically. I was amazed at the difference in battery life this made as it was very similar to OS X. From what I understand, the current MacBook Pros with Retina Display boot Windows using EFI now. Do these machines benefit like the MacBook Air in getting the exceptional battery life, fast boot times, etc.? Is Windows aware of the dual GPU configuration instead of only using discreet graphics on the newer models? My early 2013 just recently has the backlight go out in the display, and I have not decided what to do with it yet - spend the money to repair it, or replace it. It is an i7/512GB/16GB model so it may be worth repairing, but it if the new ones has the option to boot Windows that I need on occasion to run natively and not get the horrible battery life, it may be worth considering replacing. Does anyone know what models started using EFI to boot Windows? I know the original 13" with a SuperDrive is a 2012 and does not, but I am assuming the 13" and 15" Retina models all do now? Thanks.