Made a little more progress. Here's how the belly pan turned out. Not really fancy but no one sees it anyway. I do wish that it didn't add to the road noise but there are always trade offs.
the fiberglass batt is actually helping a bit but I'm hoping my new hood liner does a better job. Fastened some rivnuts into the hood for attachment and added a few bits of insulation in the voids.
Installed my new bubble foil reflective liner.
Hopefully it helps. Still have the lean burn problem to sort out. Not sure if that is really going to hurt my mileage too much.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km