To be fair, my gallardo was costing me £100 a week in petrol alone. But once I got in it, money was a distant memory.........If i was paying £100 a week to drive a @*!# heap I'd sell it asap.
As long as the zed provides the enjoyment you'd expect, keep it. If, all you think about,when driving it, is mpg, tax, insurance, depreciation etc then you need to get rid