you should see the fast guys going out...30+ mph for hours at a time,those guys can crank out some watts...im just getting into the interesting range now with the mileage i can do in a day,gaining the ability to sit in the saddle for hours and keep the pedals cranking over...the surly is more a just chug along sort of bike,good for covering distance if youre not in too big a hurry,especially towing a load...i never really feel like i absolutely have to stay on top of whatever gear im riding...im not really supposed to go fast on that bike,its for exploration and travel...thats why i have a road bike that only weighs 19 lbs...different forms of suffering...both fun...can hardly wait to get the next bike! this one will be a fat bike,a surly pugsly with 4 inch tires...they can pretty much go anywhere,not phased by deep sand or rocks or snow or anything you can pedal over...
You said the magic word: SUFFERING
I've observed that "the-willingness-to-suffer" trait is a very desirable trait to find oneself with. I myself am not a naturally talented athlete...but I do possess copious amounts of that willingness. It's a strange thing...pushing on in pain..keeps one in focus.
I'm in a constant state of being beat up...never not hurting somewhere. Never not working through an injury or a discomfort. Never physically 100%.
If ever comes a day..where I'm not hurting..then I'll know I stopped pushing