All i can say is on the caravan forum i use a chap has run up 200k on his renault laguna, using supermarket fuel, its the 2l petrol engine i believe.
I did have a 180bhp 1.8 tubo audi w reg, which was rated at 180bhp when used with 98 octane, i nealy always used 95 and was pushed to notice any power or economy loss.
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