I've been wondering about this since the last refresh of the Macbook Pro range...I have a need to run some Windows-only software, and I've read in the past that many people complained about lower battery life running Windows under Bootcamp on their Macbooks. This turned out to be the result of the Discrete Graphics Card always enabled for Windows, with no way to only use the integrated GPU.
I see now with the last refresh, that Apple have a Macbook Pro Retina with an Intel Iris Pro only option (no discrete GPU). Would it be reasonable to assume that I could get better battery life out of this new Macbook option under Bootcamp, than with previous Macbook Pro iterations? I'm certainly aware that Windows is nowhere nearly as optimised as OSX, and hence will not not be able to claim the same battery sipping status of it.
I work a lot on Magento and Drupal site development, and occasionally develop the odd nopCommerce (.NET based) project under Windows. I also make use of Adobe Photoshop CC for slicing up web designs handed over to me, and fool around in Sketchup every now and then. I don't play games on my laptop...purely work. So I believe that my graphics processing needs are very small.
Ok, I've gone off course a little, but getting back to the main question - Would it be reasonable to assume that I can achieve slightly better battery consumption by choosing the Retina Macbook Pro with Intel Iris Pro only option?