Maturity...and you have a K8, so you'd have no idea what it's like with a ZE under the hood...
But given that, 10 over in city and 20over on the highway (note, this is in Km/h) is the norm. Those are my typical speeds i drive and have never been hassled for it. Man, even my parents drive by the unwritten "9-over" rule for as long as i can remember. In Ontario, you only get points deducted if you're 14 over anyway. Over here, typical cruising speed is arund 120kmh anyway (higher on the 407ETR or on the 401 between Toronto and Ottawa). The only people I know who've gotten tickets were 20+ over in an 80Km/h zone and 30+ over on the highway, so i tend to follow those odds with yet a single speeding ticket, but I very limit myself. but years and years ago (about 6) I got a virbal warning about a 57 in a 40 zone. Oh, and apparently this week a co-worker where my girlfriend works for a ticket for 95 in a 50 I think, this week. It's a very expensive ticket. You know, there some forgiveness in town, like 10km over is easy if your not paying attention, but almost doubling the speed limit in 40 and 50km/h zones is just stupid.
I will admit my confortable cruising speed is 140Km/h and my top speed is a hair over 230Km/h, I am very cautious and limit myself to the extreme speeds maybe a few times a year.
But your speeds and your need to be out front is exactly how I drive. Personally, I believe that being out front helps avoid accidents caused by stupid drivers, and on the highway, because of that, there are only 2 other types of people that catch up to me, faster drivers, which would get pulled over first, or cops, so I take her easy if i can't identify the car behind me coming up faster than I. With that, I only really need to pay attention in front of me. Remember that it's like playing hide-and-seek with cops; If there's a place they can hide, they probably will. Take her easy around those areas (around corners, under overpasses, on onramps so you can't see them until you've passed them). Being ignorant about having a fast pace if only going to get you in trouble..
I also live in a small town and region in which my car seems to be well known and preceeds me, but I try to respect other drivers for that fact, unless they really piss me off.
I lagely go to legalized and organized events, I'm actually going to a SoloII (autocross) event today, pending it doesn't rain, but I can't wait, I've never been. There's a drag strip about 40min away. I used to do all the time, but i wont be going back until i get my tranny rebuilt this winter. Dunnvill and Shannonville have laping days, Dunnville not so often, but i's only 30min away. Shannonville has regular events, but it's about a 2.5 hours drive away. Unfortunately due to work/plans, I have yet to attend any of those type of events. But going to the track and such and getting yourself off there really helps to subdue your "Need For Speed"
I constantly find myself driving to fast, usually 10 or 20 over. I like to be out front, if I'm not out front I start to pass 
I live in a small a-- town and apparently I know how to piss people off 
and I love corners 
I tripled it once and I'm glad there weren't any cops around 
. 90mph in a 30. The circumstances were that it was late, there was no one around, and I was trying to put space between be and the ideot behind me. He pretty much stayed on my bumper until I took a right-angle turn at 30-35ish and slid around a curve at 90. I don't think his new BMW was capable of handling the way our cars do 
