I have the 450nk, and am a bit disappointed in the forward leaning handlebars, the foot pegs being so close to the seat.
Hurts my knees after a while of riding.

Ok for a young kid, I'm 45 and my knees can't be bent for 2 hours like that.

I only have my bike for 9 months and 2.5k miles and it struck me, that it just doesn't have enough power. For riding by yourself at legal speeds, yes, but my buddies regularly sprint past 100. And with a little headwind and the speedo error of 7% overreading, makes that the 450 is really a 85-95mph bike tops. Less if you have hills in your area.

I'm looking to upgrade to the 700.

I'm specifically looking for a second hand 700cl-x heritage model with brown seat.

I currently own a 450nk, and while it's a very nice bike, occasionally the buddies want to do over 100mph, which the 450 doesn't like.

I want something bigger, but not too much bigger. I don't want to get in trouble with the law. There are areas around here, where we can do 100mph undetected (no supervision), and I wanted a bike that would do it.

If you can answer any of the following questions, I would be very thankful.

1- do you actually get 150 miles out of a tank; or is that the minimum, average, or maximum?

2- I will want to change the gears a bit. For that I need to know:
2a- what mph you get at idle rpm in 1st gear (5mph?)
And,
2b- what rpm you get at highway speeds (60-80 mph) in 6th?

3- what rpm does the bike prefer? (My 450 can run final gear between 3 to 12k rpm, but really prefers between 5-7.5k rpm).

4- what rpm is the redline and rev limiter?

5- can I install a freeflow intake, and 51mm exhaust easily, without requiring a tune?

6- any of you installed a lithium battery? If so, which one?

7- is the bike's seat and rider triangle comfortable for longer journeys (coming from a 6'+ tall touring bike guy)?

And 8- outside of exhaust, intake, sprockets, and battery, what are some more weight reduction mods you can do?

Lastly, 9- is there a solution to have a larger fuel tank? (Inline fuel tank, or other?)...