.2 eu loss per-block. Regardless of packet size. All answers are rounded up. So up to x4 blocks for copper (.8 loss) the answer is rounded up, and no loss occurs.
Yes Every packet looses .2 eu every block regardless of packet size (rounding is done at the end, so it doesn't concern me now), so when I transfer 2EU/T (first line of the table) I can:
A) transfer it in 2EU-P at rate one packet/t, so EU loss is 0.2 per t per block
B)
transfer the same amount of energy in 32EU-P, so I send 1 packet every
16ticks, so I lose 0.2 EU per block only once every 16 ticks, thus amortized
loss per tick is 0.2/16 = 0.0125
Edit: It is also the same as the formula on the wiki Total (EE/b) per tick = (EU/t)/(EU-P)*EU/b
So larger EU-P has to mean smaller energy loss.
I understand that, when you use copper cable, up to 4 blocks the loss is 0 regardless of packet size, but if you tansfer over 5 blocks, with 2EU-P is the loss 0.2EU = 10%, and with 32-EU-P is the loss same (0.2EU), once very 16 ticks = 0.6% energy loss
Edit: I will test it on IC2 when I get home.