I actually drive on average 5-10 over....5 if i'm around town, 9-10 over if i'm on the highway. I don't gun it getting up to speed though, I take off like an old fart...lol.
I do speed limit +5 for the most part...or at least as best I can tell with my fubar'd speedo. Probably increase that to speed limit + 10-15 on rural highways....I just don't trust the idiots on the road enough to go much faster....take away the morons tho, and the right foot gets a little heavier. =)
I voted 10 over cause that's usually about what I do in the Jeep.
In the Mustang or Grand Prix or any car that's not an SUV/truck, move me up to "very spirited"
I do always stay within the limits of the vehicle and conditions, I don't swerve, weave, or change lanes frequently. I always signal, and I don't try to go fast when the flow of traffic is slow. I would consider myself a generally safe driver. I'm also convinced that speed limits are only for safety in some areas. In many areas (most notably interstate highways), they're in place solely for generating revenue for the state. Given the right vehicle and road/traffic conditions, one could drive 150mph on today's Interstate system safely.