I purchased a 2013 Insight back in March that had about 44K miles on it and the car is in really good shape however, I'm not getting the mileage I anticipated. I do practically ALL highway driving and when I filled my tank yesterday, I had traveled 310 miles and the car took 8.1 gallons of fuel. That's roughly 40 MPG. And that's highway. I am running the AC but does that make that much of a difference? Also, my range indicator said that I only had 35 miles left but yet it only took 8 gallons of gas. Is this typical? Can I count on an additional 70 to 80 miles after the range indicator says I'm at 0?