Originally Posted by Cheech
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?
It's gotta be speed, low tire pressure, non Low Rolling Resistance tires, big loads, wrong oil in the crankcase, bad alignment, bad gasoline, dragging brake, bad 12v battery, big head winds? A combination of some or all?
I just did a 53 mile trip into South Portland, Maine yesterday in single number temperatures above zero. I reset the trip/mpg because it was so cold and wanted to see what the Insight display would indicate. Ended up going in via interstate at 67 mph and returned on back roads 45 to 55 mph. It's a pretty hilly route both ways and there was a little bit of a southeast wind that I bucked on the way down the interstate.
Ended up with and indicated 49.9 mpg reading which would put it in the 47-48 mpg real world range. I inflated my tires last week to cope with the expected cold air, so pressures were probably 37 psi front and 36 psi rear. I have OEM tire sized Firestone Champion Fuel Fighters that have allowed the same MPG numbers that the original Bridgestones produced.
The lowest MPG numbers I've ever measured on my 2013 Insight is about 47. That was in dead of Winter. Spring-Summer-Fall numbers consistently stay 52-57 mpg. Those figures are trip measured miles traveled to fuel added to tank at fill up. Not the MID indicated MPG.
So I don't quite understand 40 mpg, even with the A/C running.