High utility cost for 3 and 6 plexes

[Travis Sun]

I've been looking at some 3 and 6 plexes and they have extremely high utilities costs. For example, the 6 plex has a utilites cost of 8800/year and the 3 plex has an utilities cost of $4400. The 6 plex is an apartment building, and the 3 plex is like a house. This feels rather higher - I originally though more rooms would equal higher efficiency.

What would be a good cap rate and roi on my investments?