My city economy is 12-13mpg with a lot of stop start driving and cold weather nothing higher than 32f so the engine is never really getting up to temperature.
Rlith, not trying to overstep my word here, but I would take a toothbrush and some TB cleaner and scrub that TB butterfly, it looks a bit grubby.
And maybe consider the PCV catchcan to stop that oil and gunk getting into your intake if you want.
Just a thought, nothing implied.