I just read through the entire thread! Interesting. Very interesting. I'm very tardy to this party! Oh, and I just saw a silver ZX2 20 minutes ago
Its kinda like a Taurus and an insight had chill-wren. The lean burn box and turbo talk definitely caught my attention.
IF I can ever get my '61 Beetle engine back together (waiting on connecting rods) I may get brave enough to eco-mod it. It has EFI running from a 1991 something ECU with the old CB Performance 4 dial box and Schwitzer turbo(very small) on a 2176cc engine.
I have a dial for idle, main, transition, boost. My LM1 wideband quite working but before it did I would run supper rich until I got into boost just past 5 psi and I would run lean. It started out getting 9 mpg! Right before the lifter bore let go I would get 19. Wonder if I can learn something about how to get that thing working better. It only has a turnable TPS, no idle control (I just dial up the idle knob three turns for cold start) and I have an adjustable fuel pressure regulator set to 100psi. I locked the timing to max of 21.
Most of the time I drove it around with no more than 3 psi. That had plenty of get up and go. I know a guy with virtually the same setup getting 35 mpg using megasquirt.
My old '87 Dodge had a lean burn computer that worked with a Carter carb and just adjusted timing upwards of 50+ degrees I'm told so I'm hitting many of the things you've gone over here including pressure washing carpets and mission trips. Keep it coming!