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The 'empty' reserve varies a lot by car. In a Malibu I could drive a 100K before it would actually become a problem, for instance. Judging by how quickly it starts dropping from full and what I put in without having to sort of 'tread the needle' I always figured the reserve was sizeable.

As for the lubrification of the fuel pump, It's more of a matter of not running out of fuel. If it's pumping air, sure, you have a problem, but it's unlikely that will happen from just running under a quarter of the tank or empty, even. I'd be more concerned with the factory oil change interval being this ridiculously high if I were you.
 
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