SpartyBrutus nailed it pretty well. Regen and Assist are to be avoided as much as possible for maximum FE.

In other words, the assist affinity is affected by SoC and the higher it is the harder it is to prevent assist... and since the HCH-II pack is not deep enough it becomes very important to avoid a high SoC as much as a low. In my scale: 7-8 bars is high, 5 or less is low.

The strategy I recommend for folks who drive 100% city duty on an HCH-II is to manage their SoC so that it stays between 5 bars 7 bars. The ideal seems to be a six bar level and once we get to that level it is easy to sacrifice a bit of FE with a hidden regen at 50+%LOD to keep it there.

I recently demonstrated this to a News crew while pumping out city segments of 84 MPG (2.8 L/100K).

Cheers;

MSantos