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I DRIVE a 1988 Magna that is post-unleaded fuel. I have been using BP Ultimate because everyone says it's better for the car and more efficient. It doesn't seem to make a difference with the fuel consumption (11.5-12 l/100km). Is it worth using Ultimate, should I try a different brand, or just use normal unleaded?

EACH fuel company offers a 98 RON fuel above regular unleaded and each makes claims about the benefits of their particular fuel. They aren't the same so trying a different brand may work, but I would use regular unleaded in your Magna. I believe the benefits of using the higher-grade fuel are negligible, which your results suggest.

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