Quote Originally Posted by Acko1991 View Post
Would it benefit the vehicle to have a really good run at least once a service period.....IE: over 4 hours highway driving.....Would that lessen the build up of carbon deposits?
If the engine has a fundamental design flaw, then no amount of driving will really prevent it. It may perhaps reduce the rate of buildup, but ultimately, you'll need to dismantle the engine and clean it.

At the same time, not all engines are affected to the same degree. As the 1.2 TSI hasn't been around for that long, I don't know if it's particularly prone to fouling up its intake valves. Also, the OP mentioned buildup in relation to the intake manifold, not the intake valves themselves (though feel free to correct).

For example, in this article (Direct Injection Fouls Some Early Adopters), some engines from other manufacturers have managed to avoid such buildup.