Actually it’s about the TFSI VAG engines. In the instructions it says, you should use 98 octan fuel, but it’s also 95 octan fuel. Does the manufacturer do this, in order not to have to prescribe the unconditional use of 98 fuel, which may make the sale difficult. With the old TT with the 1.8T engine, there were several variants. The smallest had 150 Ps at 0.65 charge and needed only 95 octan, the next 180 hp with 0.8 charge needed 98 octan, the 224 hp also 98m octan . Therefore the conclusion. Do not the TFSI need from house 98 octan, and only the knock control prevents worse. Next conclusion. With chipped TFSI there would not be 98 octan already the lower limit, and with further use of 95 octan even more knocks and uncontrolled combustion and therefore also more turbo damage in Chiptuing. How does the knocking affect the loader ?