Do I buy another derv? 25, 45, 75? MG?

So I've been driving my beat up old 220D for 4 and half years and while its been a reliable old work horse its definitely time for an upgrade. One thing that has kept me driving the 220D is its low running costs, it delivers 45+ mpg no matter how its driven, spare parts on ebay are cheap and actually not that much has gone wrong with it.



So, if I were to get another derv how will the running costs compare between the 25/ZR, 45/ZS and 75/ZT against this old 220D. Obviously I'm not expecting a spreadsheet from anyone, just some experienced opinions.



Thanks guys.

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