I was thinking more the flat 4 design not necessarily an actual Porsche engine.  Doesn’t Subaru use flat 4s also?

That would be a waste of a sweet engine. I don't think an EREV needs anything that exotic.  Needs to be better than a noisy old Briggs & Stratton, but not quite up to Porsche qualities.

Could be different suppliers or an assembly problem.

The data doesn’t support that conclusion.  The data says people are driving less in EV mode and more in ICE mode than expected.  Period.  That could be caused by not charging but could also be because people are simply driving more miles per day than estimated as I already pointed out,

A Porsche flat 4 would fit nicely.

Not sure where the truck would put it.

Honestly, it's more that I don't care enough to actually look at/into the numbers.   It seems to boil down to the fact that people don't use them as intended and/or governments have policies that force people into mis-using them (i.e. the EV mode in cities, vs. optimal usage).

Maybe them scientists at T&E didn't "forget" to factor human nature, but the results of the study sure do show that the natural human inclination toward laziness or status quo is a big factor as to why Plug-In Hybrids Are Five Times Filthier Than You Think They Are and why the automotive industry is calling to weaken the regulation for car CO₂ emission standards: Big shots at EU regulatory agencies ain't puttin' in the effort to understand real world behavior of PHEV drivers when calculating emissions numbers PHEV drivers ain't plugging in as often as the big shots at EU regulatory agencies expected, either due to laziness or because they can't Big shots at automakers and suppliers ain't puttin' in the effort to further develop Europe’s growing EV value chain

When Rivian first rolled out, with their Ford investment, I had hoped they’d use Ford as a “ghost kitchen” for service.  Why build out that infrastructure? I’ve been wondering if Scout/Rivian won’t do that on some level.  It would seem like there could be mutual benefit to both (For instance imagine if Lucid partnered with Mercedes for example).    Relying on independents seems fraught with issues. I cannot imagine taking that gamble on investing if I owned a shop. 

Call me a skeptic but I seriously doubt they “forgot” to factor human nature.  It’s more like it fit their agenda better, hence went with biased assumptions.