Hi mate you are asking about the fuel on the ST170, I had a 20i 16V Zetec and bought my first ST170 last week and beleive me same size of engine just more horses there, if you are heavy footed you will pay for it, lice me the other day £25 quid and only 70 miles but well worth the fuel some machines after driving this ST for the first time after driving a x reg zetec 20i 16v amazing can only amaging what the new ST and the RS are like mmmmmmmm