So pool.sumokoin.com says network hashrate of 2.5mhs, with a pool rate of 1.5mhs
sumo.fairpool.xyz doesn't post a network rate, but has a pool hashrate of 2.5mhs.
My math is a bit fuzzy, but it seems like the network hashrate should be at least 4mhs... what am I missing?
I think you misread number, sumo.fairpool.xyz has about 150KH/s only. However, network hashrate is a statistical number and it's sometimes diff from actual one.