Sort of leading on from another thread, I reckon my land rover on LPG costs about 20p per mile on fuel alone.
I've never kept a proper record, but I reckon insurance, repairs and maintenance using second hand parts and tyres where possible is well under £1000 a year, or 10p per mile at 10k pa.
Counting depreciation as nil, that works out, very, very roughly, at under 30p per mile.
How does that compare with a normal car ?
I know there are so many variables that it's impossible to give a definitive answer, but would a modern efficient car with good fuel economy, but poor resale value, beat that ?
What about a cheaper older car that's already lost most of its value, but is not so good on economy ?

