Not really relevant to you but I have found the super unleaded gives better performance in my trad +8. There is a stretch of road near us with a gradual incline. With my foot to the floor standard petrol results in knocking. With super there is no knocking, it just flies! May be I could get the same result by tinkering with the timing but it is easier to 'pump the super'

1994 +8, BMW Calypso Red.
2002 4/4, 4 seater, BMW Calypso Red.
How do you open the boot?