Has anyone done a comparison of the different types of petrol we have in Singapore as to which gives the most power/torque? There is an article in the latest EVO magazine and the results are quite surprising. Some 95 octane perform as well as 97/98 octane on a Golf GTi. But on the M5, there was hardly any difference! They also concluded that the "freshness" of the petrol is the most important, so go to the most busy station for your next fill-up!