Just got back from a 2,000 mile road trip, including Kentucky, Tennessee, North Carolina, Alabama, and Florida. During the entire time, only saw three C-7s; two in Destin, Florida and one in Birmingham, Alabama. I was really surprised at not seeing more.
I drove the "Tail of the Dragon" in Tennessee/North Carolina and thought it was pretty anti-climactic, but still fun.
Averaged 28 mpg for the entire trip, including a lot of lower-gear mountain driving. Never used 7th gear.

I drove the "Tail of the Dragon" in Tennessee/North Carolina and thought it was pretty anti-climactic, but still fun.
Averaged 28 mpg for the entire trip, including a lot of lower-gear mountain driving. Never used 7th gear.