fuel pump update x15

[Konstantin]

The maint costs of a CM871 are slightly higher vs. an old N14 over the million miles.. but it saves far more than that in fuel over its lifetime.. and that is the point I always am trying to make with newer engines vs the stuff of yester-year.
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I wonder if it is possible to fine tune n14 in a similar way we could tune isx? To install maybe waistgated turbo and such. When I drove my old engine I would get around 6.5-7 mpg. I was driving a bit slower then at around 60 mph. I think with what I know now I would make at least 0.5 mpg more.