I'll let someone else do the full calculation..
The supermarket transport depot I work at a couple of days a week has 120 tractor units running at approximately 10 mpg.
They go out with different drivers two or three times per 24 hours 7 days a week and refuelled each time with, on average, 100 litres of diesel.
Fuel is slightly cheaper than garage prices but still going up in price.
Plus the refrigerated trailers use normal diesel (red diesel is now banned)
No wonder the cost of shopping is going to go up!
I get that to £57,600 per day, at 1,60 per litre for fuel alone, then you have to allow for the drivers wages, maintenance, M.OT's, insurance,tractor unit rental (I'm sure they're on long term hire these days) trailer rental too, then add into the mix all the forklifts, Order Picker & Electric Pallet trucks (One site I go to has 200 forklifts of various types on long term rental) which need charging up or a fill up of LPG to keep them going, plus on site engineers to service & repair them, as well as a garage for HGV repairs, you can see how this is starting to mount up to eye watering levels, then repeat for each regional distribution centre they have!