£70 is about 50 litres @ £1.35 per litre. The Zed has an 80 litre tank? 200 miles from 50 litres is about 18mpg, so about right if doing short journeys and blasts.
Yeah, This.
A full 80 litres will cost you about 100 quid so what your actually using is about right for regular short journies.
Incidentally, regular half mile journies will do the car no good at all. Your oils will never be getting up to temperature.
Surely this is irrelevant? Long journey or short journey, everything isn't up to temperature for the first 10 minutes. Yes, mile for mile the engine will be in less tip top condition than another car with the same mileage that's driven 50 miles each way to work, but day to day it's no different, both have to warm up.