Bitcoin Fee Experiment May 9 2016

[mocacinno]

I'm pretty sure you'll get a completely different result if you would run the same test several times spread over a couple of weeks.
As said before, i think it depends on how many transactions are in the mempool, how big they are, which fees they have, which pool mined the blocks, how big the blocks were,.... From time to time, you also see allmost full blocks for 3-4 consecutive blocks. I'm pretty sure that your very low fee transactions wouldn't have been included in this case.