Dye for your oil.
  You only have to forget once to put the oil in, especially if you take 'raw' fuel to mix at the meeting.
  3 drops of dye put into the litre of oil on first opening the bottle, then every time you mix petrol and oil your fuel is coloured. I use an eyedropper pipette (bought from the chemists, with the accompanying bottle) and so far it has lasted over 2 years.
  Last year I saw more than one person save his engine because the fuel was the wrong colour immediately, rather than filling the tank before thinking it might not be oil-mixed.
  Yes, I know you can use different colour tanks, tie wraps on the handle, labels and so on....or even buy oil with the dye already included ( the oil I use Castrol 747 is neutral in colour, so dyeing it when I buy it makes sense, however many bottles I buy).
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