Wes, I had a hard time believing the mileage myself but I drove to Washing DC, little traffic, cruise control at 65 with once or twice up to 85 while passing. I used the AC on the way back for maybe 100 miles. I topped off when leaving my home and used the same station and pump when returning. I traveled 386 miles and filled up with 11.6 gallons. The only thing I have changed is the K & N filters. Other than that, who knows. It seems that this car just gets better with age. I now have just over 8k miles on her.
It was VERY difficult not to zip around what traffic I did have but I was really interested in seeing what the mileage could be. I also have EZ-pass so I did not have to stop at the toll gates.