A friend of mine has a 2013 Subura Impreza hatch, I'll test your theory and see what happens in my ST when he's in 3rd and in 4th and I'm in 6th for both runs.An S2000 is not a typical 2.0 naturally aspirated engine. I am talking about all the Foci, Corollas, Subarus, M3s and cars of that category.
BTW, the proper following distance is a minimum of 2 seconds. The two second rule will create a larger gap as your speed increases. If you have to think about what the proper following distance you are not a defensive driver, it should be automatic.
Well, in any car the following distance or distance between you and the driver behind you can be different. I don't know what you see day to day as far as traffic and if you take notice to how closely people following others but most don't give the 2 second gap or more that you're supposed to. There are tons of scenarios that can come into play on the road. If I see a car in front of me that's an older car with drum brakes I know for a fact I'm going to get stopped quicker than him. So my following distance wouldn't have to be as much compared to a newer high performance car like a Ford GT, in that case I know that car can get stopped a lot faster than my ST so my following distance must be increased just in case the GT would have to slam the brakes and come to a complete stop.