ArsTechnica: We decided to find out how much data a typical Siri user might expect to use in an average month. We carefully watched our data usage while performing 11 different queries through Siri, split between local phone tasks and tasks that required lookups from the Internet. We also performed four dictation tasks. Your milage, of course, will vary depending on the kinds of things you might use Siri for and how often you might do those things. With that said, here's what we found.