Guys run your vehicles like a business
CAPEX - what you spend cash on purchasing outright. Vehicle (cash buys), accessories.
OPEX - what you spend keeping it running. Fuel, insurance, consumables(servicing, tyres, brakes etc)
Depreciation: don't calculate on some guideline like 15% value loss every year. Calculate the Asset value.
Asset value: At any specific moment in time if you sold the vehicle, what is it worth? (Including accessories bought under CAPEX) Does every cent of sale price estimate come back into your pocket? or what's left to go into your pocket after loans are paid out? It can be a negative number (sale price won't pay off the loan!)
Now add CAPEX and OPEX, subtract Asset value and divide by KM or days.... That's what it's cost you.

