20-25 MPG from a petrol ST? I doubt it's that bad tbh
As an owner of a Petrol ST estate for 4 years now and previously a MK5 GTI, I can confirm the MPG on the ST is rubbish and far worse than the Golf. I average 22-23 around town and up to 34 (35 if I drive like miss daisy) on the motorway.
Not an issue for me as I only do circa 6k a year but could be a big problem for others.