I've always gone the speed limit or just a tad above (because of traffic flow) because going any faster is inefficient in so many ways and only increases risk. Even on a long trip that 10 mph over is only going to gain a few minutes, and you've used more fuel. Why bother? Plus there's the fact you mention elsewhere of not standing out as a target. Not that it matters, I feel enforcement is highly variable, and I've seen on highway trips people going 20 or more over in a construction zone, and I wonder where the cops are. Only when they feel like it, I suppose.

The one good thing about a toll road that I'd support is how it can measure an average speed, and someone speeding that much over has no way to easier balance out the math at the end, so instant ticket/justice. I mean, they could just limp the last mile or pull off, but that's waving red flags to anyone monitoring.