Originally Posted by 2012ISport
...but isn't it possible some of us are experiencing poor fuel economy for reasons out of our control.
Yes, of course. You can't control elements such as temperature, wind, how hilly the terrain is, the ethanol content in your gas, altitude, the number of miles to your destination, and more. But you can control your speed, rate of acceleration/deceleration, tire pressure, use of cruise control, and so on.
So control what you can to optimize your fuel economy.