I started noticing a reduction in range on a full tank of gas on our 2012 Prius V. When we first bought the car it consistently got 440+ miles per full tank. Now that the car has gotten older, in the past 2 years I've seen a significant drop. After each fill up I noticed that the range on the display never goes pass 375 now. Is this due to the age of the vehicle? Anyone else experience this?