My issue was resolved eventually (took about a month with one week lag in their replies and it was me who figured out what was going on, not the support).<p>It looks like the App Engine documentation was finally fixed. It used to say &quot;If you do not specify a class, F1 is assigned by default.&quot; as recently as a few months ago. For a long time the default was actually F1. Then one day my costs went up unexpectedly. The default instance class had changed without notice (at least none that I ever saw). I didn&#x27;t know that&#x27;s what had changed though and I emailed billing support just asking what happened. Canned reply email after canned reply email with requests for tons of information they already have (including information I typed into the original support request form). They also had me take screenshots of my console (can they really not look up my information?). And sending me the canned emails takes a week for some reason.<p>I should probably point out this was billing support. I&#x27;m not sure if that&#x27;s a different department or what but I&#x27;m pretty sure they have no idea what they are doing over there (or, at best, just don&#x27;t have the time or interest to help smaller paying customers).