I use the 68 T/C wagon for family vacations almost every year....usually close to 2000 miles. You can't put a price on the "cool" factor. My 440 is a 71 vintage with probably 90K + miles on the tired bottom end. New heads, new stock grind cam and lifters and a 73 440 spread bore intake so i can run my favorite carb...a Thermoquad. Bone stock 727 auto, 3.23's with 225/75/15 tires. I live, and vacation, in the high mountains of BC and see about 14+ MPG with a wagon loaded with gear, and 4 people. Figure I'm tipping the scales just over 5,000lbs.
My daughters have stated that they would be embarrassed to vacation in a "regular" car.....