Many people don't store their cars at their own property/facility so not properly securing it could be an issue. However, locking is a non-issue since you can always gain access using the mechanical key in the door lock cylinder (test your emergency key to ensure it is cut correctly). I would rather have the windows rolled up to minimize the entry ports for mice or other living creatures looking for a place to nest and things to chew on.

 

In the UK Shell has 98 octane (RON) with 5% ethanol, or regular 95 octane with 10% ethanol.