2010 insight ex

My Insight mileage has dropped to 35mpg. I know it needs major tune up will that help and is it wort it

Hi everyone I am PunkSmurph and I now own an Insight. I picked it up last night from a Subaru Dealer, it was used and in mint condition with only 36K miles on it. The car is fully loaded and I have the Navi. My last vehicle was a 2010 Mitsubishi Lancer Ralliart, if you don't know what it is...

Did anyone have experienced any battery issues? I noticed that the battery on my 2010 insight is always not fully charged (showing some dark space on the battery icon). In addition, every time I drove over a steep slope, the battery power level become very low and the car kept charging even at...