I see around 7-8mpg at donington.
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FWIW I used 74 litres in one track evening.
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That was just over 300kms which included the steady motorway cruise up and back.
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Combined for the distance was 12.97mpg, and I can see close to 30mpg on a motorway run.
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Similar story, 14mpg doing a round trip to silverstone and a few hours on track.
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