More VROOM power......i hope

My car clocks in at 7.7 km per litre of petrol which isn`t good. On a full tank of rm90, I only get as far as 350km. Bad yah the FC ? Yeah, tell me about it. A neighbour sells this engine oil treatment which she claims is good. So I`m testing it out. Will let you know the results in 2 weeks time. It`s supposed to increase power, reduce engine wear & lower fuel consumption. Btw, I just found that a Toyota RAV4 actually costs more than a Camry. Wah. Standard nyerrr...Beamer 3 series pun around the same price I think. Hee hee hee. The new RAV4s` laa. Not mine though.