Don't be too discouraged- right after I filled up and only drove a few city trips I was averaging mid 17s.
I drive my car every day, but take the bus to work. 6:30am I head to the gym which is .9 miles away and then back- the cold light usually goes off as I pull into the JCC. Now I'm averaging 24.9mpg. Yeah, I'm not happy but it's better than what my Subaru got and it's on regular gas.
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NoMoreNissans 2nd gear is really versatile in this car, try to get out of first if you can and use 2nd more. I bet your consumption will drop