Thread: P400 petrol

Has anyone experienced much of a difference between unleaded 91, 95, and 98?

Changing the octane rating will alter how the various sensors respond though. Altering timing etc. My old Mk 5 Golf would get better economy, but you would need a slide rule to calculate it. My Barra Ford doesn't care, it drinks like a sailor ashore for the first time in months. No point giving it top shelf.