Where can I save the most on car expenses?

The overriding principle is that owning and running a car costs money; how much depends on a combination of factors and more. 

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What are the biggest costs of running a car, and where can the most significant savings be made without undue risk or compromise?  Several readers.

There can be no exact answer because the variables between vehicles, owners, and use are numerous and often extreme.

PAYE Tax Calculator

Note: The results are not exact but very close to the actual.