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.

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

Also depends how you drive it.

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