P0171

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hi I have a 2010 Toyota Camry Hybrid which is now throwing up a P0171 code, I also have a scangauge as an accessory that measures fuel economy, on my scanguage my fuel econony is very good, just like when i first got the car but the built in dash gauge on the camry the fuel economy is poor, I cleaned the MAF sensor and replaced the air filter and cleared the code but the code still comes up, I noticed the LTFT level goes over and stays around 34 mark while the STFT level is around 0, however the car responds very well and I do not feel any sluggishness. What could be the issue with the code coming up?