I use the kilometers (miles) travelled as a guide. I get about 320 k's once it hits the red line. I can then push it for a little bit more and have a 500ml to a litre left when I go to fill up, which will have got me another 20 to 30k's.
I only push it on the red line if its on the red line when I leave work. I know I can make it home. The best I have done is 410 kilometers on a tank.
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