Man I hate analysis like these. At least yours isn't as flawed as that guy on reddit who didn't understand the difference between a Watt and a Joule (or kWhr), but what you did is still incredibly basic and ineffective. You aren't accounting for reddit simply frontloading the first page view, compared to old reddit reloading pages each link you click, or countless other possible optimizations.

Just measuring single page-loads using a browser extension is far to simplistic of a metric.