I'd like to know what, apart from a general good state of tune, do people find have worked on getting the most from their motors.<br />Anything from types of oil, plugs or fuel to those magic sprays, electronic gadgets and potions in cans. I've heard that most of them are rubbish but i'd like to know what actually works. My local workshop was praising a carby spray from Quicksilver which is what started me wondering.