2012 Kia Soul fuel system problems

My car is believed to be recalled, because the mpg (mile per gas?) is supposed to be between 30 to 34 mpg while driving on the highway. It was between 20 to 25 mpg all the times and never exceed to 34 mpg or more. The detail or guide showed that it can exceed to 34 mpg. I think maybe they lied or didn't know that it is recalled until they found out, but however they mailed me a form and with the url of the online form to fill out for the gift cards to be received.

First 2 times car didn't start on initial try, car started, tach dial wasn't functioning and car didn't want to go more than 25 MPH. Car taken to kia where they said car was fine but needed fuel inhectors cleaned and a serpentine belt. 2 weeks later car stalls at stop light, tach dial not functioning and car doesn't want to accelerate past 25 MPH. Called kia they were closing and would call back, never did.