I know that me simply talking about how stupid speeding is won't change your mind, dear Speeder. Therefore, I urge you to try the "experiment" I am about to describe - just do it.
For the reasons I can't disclose, I was forced to obey every road law (except for some "hard" ones, like never passing anyone on the right) for a period of time. When I just started driving by the book, my thoughts were: "damn, it! Ok, I must go through this, and then I'll be back". These thoughts changed after my first tank of gas - when I've noticed that my fuel now lasts me way more than a week. With the second tank I had my "revelation".
So here's my proposal to you. For the next two full gas tanks, don't speed. If you really think that you'll have to shift your schedule around as it will take you longer to get places - trust me, you don't! In fact, sometimes I come to work 5-10 minutes earlier than I ever did back when I was speeding. But how can that possibly be true?
It's best if you, while never speeding, notice the next guy who flies by you. Just remember his car, you'll see him again several times - I assure you.
I'll describe a situation I had this morning, and these I encounter pretty much daily. I get the most pleasure in the "passing by" moment because I see far in advance where the red light is and purposely let the car slow down even 20-30 under the speed limit, so when I get to the traffic light, it's green light again and I don't stop; makes me feel a skillful driver.
On my way to work, there's one traffic light with a green-left-arrow sensor that lights the left-green only when there are enough cars in the left-turn lane. Today, knowing about that sensor, I stopped about 4-car-lengths before the line to trigger it and the guy in a Nissan Murano behind me, likely confused, was trying to "push me" by creeping up my ass. This made me take note of him when we made the turn and exchanged the looks... I went up to the 60 limit, while he sped up to about 75 and went well ahead of me.
The very next traffic light... coming up to it, I notice the Murano guy already standing behind other cars in the left lane; and I am in the middle one, with less cars in it. I, very slowly, passed the guy while staring at him and giving him the look. He looked at me as well, and I am sure he remembered me quite well, as my ricer is rather obvious. Since green already lit up, I didn't even stop on the light and just sped up to my usual 60km/h.
The guy in the Murano was catching up and, I assume upset by the "slow" guy in front of him, was already in my lane. Seeing the red light up on the next traffic light far ahead, I took my foot of the gas; eventually slowing down to about 10-under. The guy in the Murano, after tailgaiting me for a bit, changed the lanes again and FLOORED it. He passed me quite fast... and as soon as he did so, hit had to hit the brakes rather hard in order not to crash into the car that was standing on the light - of course he wasn't paying attention to the light; I was in his way and he was trying to get around me.
By sheer luck, I had less cars in my lane again and very slowly passed the Murano, looking at him (he didn't look back this time).
The story repeats once again: I go up to 60 and see the Murano weave around the cars ahead. I thought this is where my fun was done, but no!
Right after the next traffic light there is a highway ramp, so it's natural for the right-most lane to be packed with cars about to merge on the highway. I was driving in the middle lane (and I needed to get on that highway) and to my large surprise the Murano was standing along with a bunch of cars in the right lane. I passed him (for the third time?) doing about 30km/h and I honked several times at him just so he would see me pass him once more.
The moral of this story is that you have to be doing much more than 10 or 20 over the speed limit in order to get the same "green wave" of traffic lights that is configured to the speed limit. Sure, you'll pass a car and perhaps go through a yellow leaving it behind, but rest assured, that car will catch up to you on the very next red.