I forgot to add that all the loan cars at my dealer are run on the cheapest grade of fuel available in Australia. The C180 (highest compression and lowest boost) is the vehicle that feels the crap fuel the most. Anything over 50% load between 2000-4000rpm is where you can feel the ignition beind retarded. This is a range where the average driver will use often so the old "I don't need performance fuel, I don't drive it hard" doesn't bear relivance anymore.

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Alex.

MB Tech
Sydney, Australia
Volvo 122S
W201 190D 2.5 manual
W202 C240
W203 C32