There is no excise to pay.
In UK we have an "allowance" of 2500ltrs per year of vegetable oils that you can use as a fuel without paying any tax. Mixing with a solvent is illegal, unless fuel duty has been paid on it - therefore if you mix with petrol or pump diesel that is perfectly legal because you have paid fuel duty on it. I promise there is nothing illegal about what I am doing, I have read up on this well and can post the HMRC documents if you really want.
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