I recently took a round tripper from Portland to Bend, Oregon. I didn't check the mileage to Bend as I didn't have a full tank. It was at about 1/2 a tank. But, on the way back to Portland, I got 26 mpg (70mph on cruise only about 30% of the time). I thought that was real good as you have to go over a mountain range (the Cascades) to make this trip from Portland. I believe on a semi-flat surfaced road trip, I could get 28+mpg easy. My car is a 6sp manual and it has 3.73s. I was using 92 octane premium, tune set to stock w/drop in K&N.