In all our $hitty predicament here in Greeceland, we at least have good pump fuel, the well-known (in Europe) BP-Ultimate, Shell V-power Racing and many other brands, all claiming around 98-99ron and the cost is ~1.70€/liter. There is definite performance difference between these and the 'normal' 95ron, going for ~1.58€/liter.
The particular TS, has 12.5:1 cr, and 300* intake, so I don't anticipate any problems. As another indication, consider that my 'road' 1.8T has 8:1 (up from 7.5:1) and I run 1.3bar (19psi) with a 10548... intake cam. So, fuel is good!
The 1.8T has a knock sensor as std so I wouldn't worry about the feasibility of putting it on the TS or any other Nord. It is fixed on a stud between cyls 2-3 on the lower side of the intake manifold. Here's how it works: when it detects knock, it retards advance (all cyls) by 2* at a time until knocking disappears. If the max of 8* retard is exceeded, it signals the famous Pierburg solenoid valve which opens the wastegate! Very effective -remember now, this is a 1985 design! As a matter of fact, if you try to increase static advance to greatly improve low speed tractability (from 8* to ~15* BTDC) the engine won't boost at all -ask me how I know
I've also talked with Stephan Lenior (Squadra Chips, Holland) and he usually insists on people taking their cars to him if its anything other than a std engine. He is right as only on the dyno he can tailor-make a proper map. Fortunately, we have several people here who can do the same -mapping of a std ecu runs ~400€.
Few years ago, I made a knock sensor cct for a friend who maps cars. The display is a series of LED's; he says its a great help in properly mapping an engine on the road. Now, if I could only design an ignition to fire a plug just
before the verge of detonation....Maybe in the next lifetime...