Fill it with the correct fuel you want it mapping to. My bro took ours and the bellend used bp standard unleaded. But on the upside I don't have to search high and low for a shell or Tesco anymore8 days to go until dyno day, will service the teg filter this weekend, not bothered about an oil change as it's only been 2k. Might regrease caliper slider pins. Any other pre dyno run tips? What's the optimum tyre pressures?