Last night I had to drive 75miles and I had less than a 1/4 tank I almost made it to my destination. I'm sure I could have made it...I was doing se serious drafting behind semis and I was driving between 55-65 most of the way. When I filled up last I wrote down 13.02 gallons and my mileage on my gps had a reading of 1,362. When I go back home today I'm going to try and drive the the same way and see how long this gas tank will last me driving the Eco way