To truly understand the "pulse" of his machine, Leo used a mix of hardware and software:

Even when the laptop was off, the charger drew a tiny, "vampire" amount of power—less than half a watt if cold, but more if it felt warm to the touch.

10 hours of gaming or heavy video editing spiked his daily bill to $0.425.

When SSDs Make Sense in Client Applications – Perspectives

Leo kept a spreadsheet, a digital diary of his machine's "diet." He knew the cost of every habit: