I recently purchased a used but well cared for 2010 Ford Fusion Hybrid in September of 2012. When I received the car the avg mpg was showing at 40mpgs. After about a month and half for what ever reason my spouse reset the fuel efficiency gauge. When it was reset the avg mpg dropped to 36mpg and it steadily declined until plateauing out at 28.5mpg. The tank was recently filled and with a little less than a full tank the display is telling me there is only 373 miles till empty. That is a huge drop from the 500+ I was getting when I initially took possession of be car. I don't have much experience with hybrids, but 28.5mpg gallon seems to be poor gas mileage for a regular non-hybrid car let alone a hybrid that is supposed to get upwards of 41mpg. The weather has been getting colder over the last few month as winter set in, 34-50°, but I still feel like I should be getting better gas mileage than this. Am I overreacting at the avg mpg's? Or is something wrong? Furthermore, does anyone have any ideas on what the problem could be? Any information would be much appreciated!