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David,
Your tests look pretty decent. The amm readings do seem a bit low compared with what I've seen, but my observations have been limited to one (1) LH2.2 car with -007 amm like yours, three LH2.0 cars and a few more -002 AMMs, and a half-dozen or so -016s in LH2.4.
But the main idea is you are achieving closed loop operation as indicated by the mixture test point and oscillating oxygen sensor output. Don't put too much on the oxygen sensor output when it isn't hooked up, because its response to minor variations is not seen - it flips like a light switch right at the ideal mixture, which you couldn't hope to achieve for more than a few seconds without feedback.
I would not spend money for an AMM especially for your poor mileage symptom if you think it is running lean. The oxygen sensor could be slow to react -- indicating lean for a longer time than the combustion is really lean, which might result in poor mileage as the injectors try to compensate at cruise speed. Only a scope on the sensor output would show you that, so for your symptom a new oxygen sensor might be worth the try.
How poor is the gas mileage?
--
Art Benstein near Baltimore
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