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Ok so i get about 22mpg average with 91 on my tune. You are definitely off quite a bit.
I would investigate for any leaks, especially if something is leaking when you fill up, its possible your gas can evaporate.
Also I believe the system is supposed to be sealed so that could be having some impact on your fuel woes.
Next the 02 sensor plays a large part in the gas consumption when not WOT. So if you dont think it is working then you need to do a few small tests to make sure its hooked up. Easiest way is to turn the ignition on and wait like 5 mins to see if the o2 sensor gets hot. That means it has power and is at least functioning.
Next i would check to make sure that the signal wire has continuity to the ecu.
And i hope someone else can chime in to explain better how to test the o2 unit beyond that.
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Z32 with lq4 swap
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