Filled up yesterday with Tesco 99 Ron Super Unleaded and my car did seem to be slightly more responsive and fuel economy slightly improved. Have always been sceptical about using SUL, but would happily be converted. I was happy with the car in standard tune (with a K&N filter from when I got it), but it just seems to get better each time I've changed things with the BSR remap, airbox mod and now SUL. So maybe Mark1319 and Duncan are right in what they say about SUL.
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