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Work out the real cost of running a car

The monthly finance isn't the whole story. Get a yearly running-cost picture from your own figures.

Updated 17 Oct 2026

The prompt · ChatGPT

Help me work out the real cost of running a car.

Finance or purchase cost: [monthly or how I paid]
Insurance: [yearly]
Fuel: [monthly or weekly]
Servicing, MOT, tax, tyres: [what I know]
Parking and congestion: [any]
Mileage: [rough yearly]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. A yearly total and a monthly equivalent, with working.
2. Cost per mile if mileage given.
3. The three biggest levers to cut.
4. A comparison frame for keeping versus replacing (no product picks).

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, figures or products. This is help organising my own numbers and wording, not financial advice; point me to MoneyHelper, GOV.UK or Citizens Advice for guidance, and to a free regulated debt adviser if I'm struggling to pay. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.

A short example

Fill the blanks, then paste. monthly or how I paid: a short note you already have. yearly: a short note you already have. Leave the rest of the prompt as written.

This does not give tax advice. The books stay in the accounting system.

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