Silvershark
HAWLUCHA!!!
Nothing new for myself, but my sister, who just reached level 8, caught a 200 CP Eevee and evolved it, raising it's CP to 403. I bring this up because my own Eevee I obtained and evolved at level 8 went from 223 to 605. So unless the algorithm that determines the CP gain from evolution is completely random (which I doubt), that could mean a CP difference of 23 (or slightly less than powering up an Eevee twice) translates into a difference of 202 after evolving (or roughly the same as powering up an Eeveelution 5 times).
So contrary to the common advice, it actually might be far better to power up your pokemon before evolution, not after.
So contrary to the common advice, it actually might be far better to power up your pokemon before evolution, not after.