Something to be clear on is that no P3 V70 is particularly cheap to run, even the diesels.
For what you describe then there's a few engines to look for:
2.4d 175PS, D5244T14: this is a "gen 3" engine (higher injection pressure, more reliable dpf) with single VNT turbo. Good torque, power, reasonably efficient, but quite short-lived in the line-up. Euro V
2.0 D3, 163PS, D5204T3: this is a short-stroke version of the above. Gen 3 with single VNT.
The twin-turbo 5 cylinder D5s (various engine codes, 205PS-225PS) euro V and euro VI are powerful and capable. Generally better fuel economy than earlier euro IV cars and less incidence of DPF issues.
With all diesels you must have longer journeys (over 1hr) with reasonable regularity (once every thousand miles or so) to ensure that the dpf can properly clear.
Any of those engines should return high 30s into low 40s mpg. Petrols unlikely to best 30mpg.
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