I'm reading mostly PDFs on my Kindle Classic (e-ink) device. Most of my e-books are PDFs, and after converting them, I've find out it's easier for me to read original PDF than converted version.
However, how does the energy consumption look like? Consider the number of page changes is the same for both format, for which format the energy used to load/parse/process the energy consumption would be lower?
MOBI is designed to be easier to read on e-book readers, but are those readers designed to process that format more energy-efficient than the alternatives?