Low mpg on Corolla 2014 Le ECO

#1
Hey y’all, so about 4 months ago I bought a used a Corolla with 50k miles on it. I did the oil change on within the first days of buying it and changed the filters, nothing really more after that. It runs smoothly however the mpg is low, I’m at 20.8 mpg, and I’m driving mainly city miles. I drive about less than 300 miles per month. Anyone know how to up the mpg?
 
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