There was a post elsewhere which was: "I'm 6'4", 260 and fit with room to spare." Another post of I am 6'2", 235 and I do not fit comfortably -- though there was a subsequent post of how the battery had been run down at the display, maybe causing inability for that person to properly adjust the seat. The interior dimensions are almost identical C6 to C7, it might depend on how one's mass is distributed. Additionally, regarding the first post "fit with room to spare," that person posted that with the standard eight way power seat, he found that there was a specific way, and order that he needed to adjust his seat to make it work. Here's what he (6'4", 260 pounds") stated:
"I've had a few C5s and want a C7. Took a long lunch break to go check out the car. I'm 6'4" 260 so all the chatter on the forum had be worried about fitting in it. It has plenty of room. The trick is to get the seat all the way down and back. If the seat back is reclined too far the seat won't go all the way back so here's the order I used.
1. Slide the seat base forward.
2. Incline the seat back.
3. Put the seat base all the way down. Make sure the seat base back and front are all the way down; it will tilt up.
4. Put the seat base (entire seat) all the way back until it won't go any more.
5. Recline the seat back until it hits the "wall" panel behind it.
6. Get in.
7. Move seat base about 1" forward.
8. Recline seat back until it hits the rear wall again.
I had a good 1.5" over my head before I hit the headliner. When I first got in I felt a little too close to the roof and too upright, but had more leg room than needed. Moving the seat up a little and reclining it a little more made it perfect. The steering column is power tilt and telescope so I could get it exactly where I needed it.
The car is a little tighter side to side than a C5, but in no way uncomfortable. The passenger side does have less leg room but I still fit there too. Not sure I'd want to take a long road trip in the passenger seat, but I fit w/o touching the dash or any interior panels.
Car is stunning... I'm sold. I guaranty most complaining about not fitting don't have the seat all the way down/back."