Is it just me or is 300 miles just about right for a full tank of fuel in the st 170? I can caine all hell out of it and the worst i do is 270 miles in about 4 days (i'm not talking about 140mph up and down the motorway all day long) but i can drive like an 80 year old and the best i've ever got is 305.

And does anyone rate any of the cleaner fuels like shell optimax and the other 2? i've ran 2 full tanks of optimax through and i aint gone any thurther or faster, the only thing i've noticed is the car sounds louder from 5,000 revs and upwards. Anyone else had this?