Last week I ran my 1.8 fl very low on petrol, not deliberately, just one of those things. When I got to a garage that was open no standard unleaded. So I fill up with premium abour 9p a litre dearer. Anyhoo the fl is running smoother (defo) and seems more lively (imagination, maybe). My question is, if I choose to continue with the premium petrol can I do any harm, except to my wallet? I should have searched, I know. Thanks.