Stock results are different (compared to what VAG advertises) because every dyno reads differently and we're using a different type, we have to estimate crank figures (We still provide the wheel figures we measured if you don't like the crank estimates), testing conditions are rarely identical to VAG's super controlled conditions (That could mean we're on a different part of the map that makes more or less power), variances from car to car, and this trend we're seeing where VAG cars seem to have a bit more headroom to make more than what they are advertising.
We actually went back and tried both octanes, stock. Higher octane didn't help performance at all. In some cases it can actually be a little less, especially up top. This is because the calibration is asking for only so much ignition advance and on this platform it's really dialed back. High octane burns slower, so if it's not needed, it will reduce output. Point being, if you're stock, run 87. You're wasting your money otherwise.