I fill both tanks at the same time... once the main runs out i fill it with half of the sub tank.. once that runs out use the rest of the sub tank.. helps keep a bit of lube in the tanks at all times.
Since changing from a Dawes to Tillix i have got a lot better economy.. not sure how as i have the needle/spool rate set about the same... I used to struggle to get 700km out of both... today my fuel light come on, on the main and it just clicked over 700km... So pretty much my whole subtank is bonus economy now...
700km out of a main tank is about normal for a DI?
And bonus was i got a whole tank worth of driving without having to replace my pistons
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