Even using such a formula, you'll probably find that you overrate some criteria and underrate others (typically underrating comfort and overrating looks).
I'm no BMW fanboy but to say a 3 series is equally attractive as the bloated Mondeo is unfair on the German ;-)
Also not sure I'd rate the costs of the BMW as that much worse than the Mondeo after taking into account depreciation and fuel economy.
I reckon if you didn't do the calculations you'd still have a 'gut' feeling that you prefered the Mondeo ?
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