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Air fuel ratio

Was wondering if this was normal. My 300ZX twin turbo does around 22mpg on the mototway and around 13mpg in town doing short journey's. I have an air fuel ratio gauge installed and gives a reading just over the rich point when in town and not so rich on the motorway. The 02 sensors are OEM not wideband.

 

Any suggestions.

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    Blimey. My stock TT manual gave 17-19 in town (including A40/406 traffic jam commute), 24 - 27 motorway, overall average 20-21.

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    Think the auto is less fuel efficient too. Those figures are not that far off the factory ones.

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