Looks like you're not a spreadsheet guy and know little or nothing about cost analysis. Luckily, the people that sell you things can help you make your buying decisions.
I spend a moment at the pump taking a photo of my odometer and the pump display. I spend a minute or two entering the date, the brand, the liters purchased, the odometer reading, the total price and the type in a sheet I put together twenty years ago and have maintained it through six vehicles. I can determine the precise, total cost of ownership per unit time or distance. I can also break it down by purchase price, cost of service, consumables, taxes and insurance. I have a complete record of every service and repair, and what they costed I don't mess with the tolls, because it would have been a big PITA, but now with that I just top up the easypass every couple of months so I might add it in with my next new vehicle.
My car will tell me my fuel consumption not just instantly, but continuously. But it won't tell me what I spent per unit distance for my last set of tires or any number of things that interest me.