The new Intel processors are efficient, of course if you start doing compute intensive things they will consume a lot of power, the same can be said for ARM CPU

The new Intel processors are efficient, of course if you start doing compute intensive things they will consume a lot of power, the same can be said for ARM CPUs. You can always force the new Intel processors in low power mode (by activating only the low power cores, at least with Linux) if you want to save power. Of course there are the other things a laptop is compose of that consume power.