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Well...I'm afraid I really can't be much help with this one...sounds like you've got your engine set up pretty good, and running properly. All I can do is offer personal experience.
I've got a B20 in my '65 1800. The extent of the rebuild is unknown, but it has more power than any stock B20 I've driven...except maybe a '70 or '71 1800E or 142E. When that engine had less than 100K on it, and it was set up right, I would get 30mpg in town delivering pizza, and I got about 35mpg on the highway going from the west side of Colorado to Denver over the mountains. And I could light 'em up in third if I really tried (which I only did once or twice).
So...no, I don't think you are asking too much. But...we both like SU carbs (I collect them)...so we both know they are finicky. If the car runs right, starts good...I'd leave it. But that's just me. With more than 250K on my engine now, the great power/great mileage days are long gone. So I now settle for power. And the power is still great, but I only get about 15-20mpg in stop & go driving...maybe 20-25 highway. And I'm happy with that.
One thing to perhaps try though....have you taken it to an emmissions station for a test? That would be a real quick way to see if it's running too rich. Take it to your favorite mechanic and have them check the CO% and HCppm. They might even be able to suggest whether to lean it or adjust timing....or...?
If all else fails, try a 1/2" block under your gas pedal. You'll lose some power, but I bet you use less gas.
-Matt
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