For the highest price of diesel in the UK (153.9ppl), to fill up my 89L tank with minimum wage earnings would take the following sum -
89L x 153.9p
= £136.97.1
136.97 / 6.08 PH
= 22.52 hours / 8
= 2.8 days
None of these figures (except the price of a litre of diesel) take into account Tax or National Insurance contributions.
So it costs about 3 days to afford to pay for a tank of diesel. Call it 4.5 when taking taxation of earnings into it to give a bit of leeway..
Just think, how many times a months do you brim your tank to travel to work and back? Once, twice.... more?