p per mile is only good if you do lots and lots if miles.
That isn't strictly true, it also depends on the company. I.E. I went down to telford for a meeting yesterday so ~210 miles. Company Pay 45p per mile = £95.
I only used 1/3 of a tank of diesel and to fill it costs ~£80.
True. But you have to take into account wear and tear, VED, maintenance, servicing etc.. on your own car.
Fine for one off trips, but not so good if its a regular thing for work.
If you opt out of a company car scheme and use your own car, you get the statutory pp mile, 45p iirc.
If Nick gets the monthly car allowance, he will fund his car from that, and iirc get something like 12p p mile for anything up to 2.0 Litre engines.