Sorry, I seem to have phrased that poorly! You get one more energy for each level that you upgrade. You said you had 86 gold tokens, which is almost enough to do all the upgrades (you'd need 90 total, I believe). As tigarlilyvol said, you get 8 energy at the final level, which is 4 more than without upgrades, so that's what I was referring to.
Ok, this has gone quite off topic for this thread... I've gotten my Octomaid yesterday and am now waiting to connect from her for the first time. I'm really curious how her drops will turn out over time. I know she has the chance to drop some good stuff, but I don't much like random droppers, so we'll see if I keep collecting from her regularly.