The unfortunate part of this update .... each test now burns 80 MB of data per test.
UPDATE: It seems the ping, server distance and speeds will determine your data usage per test.
UPDATE x2: Just did another bunch of tests
I've always used a further server for my testing, it's about 31 KMs and the closest server to me is 2 KMs never gives me the right speed results since they're so congested.
I'm in the Toronto/Markham area
1) Oakville server retest burned 50mb with results of 30mb DL & 12mb UL
2) Toronto server burned 35mb w/ inaccurate speeds of 5.1mb DL & 17mb UL