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When boaters fill their boat with diesel they have to make a declaration about how much of the fuel will be used for propulsion, as that is taxed at a higher rate than fuel used for domestic use.
That is a legal declaration that says "I declare that [ ]% of the fuel purchased will be used for propelling a private pleasure craft" Note that is a declaration about what the fuel being put into the tank then will be used for – and NOT what you used the last lot of fuel for.
The HMRC legal page explains what the law says and reading that may give you all the information you need.
Try our fuel duty page if you’d like further information and debate about what a reasonable estimated percentage might be.
It may be different from the advice your mate gives you down at the pub, or even different from what you see others doing, but it might make you better informed to make a more reasonable estimate.
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