I just drove from Virginia to Maine and back last week.
That is the longest trip I have taken so far, about 680 miles one way.
I find the ZL1 to be very comfortable for a long drive like that.
I averaged close to 21 miles per gallon, I usually get around 10 mpg knocking around town. I am only five miles from home to office, so it was good to get the car out there and run it.
And about three hours into Maine, on I-95, the speed limit is 75.