Last weekend I drove the Chrysler to Galveston from Dallas with a passenger and a trunk full of XF luggage. I ran the A/C and the radio all the way. I also had to deal with various construction zones and Houston traffic. I drove about 65 to 70 when possible. I got the usual 27 mpg.

I suggest that you just enjoy the drive. 27 mpg is more than acceptable for me.