If you do get that increase and its noticable £16 per bhp is reasonable value.
My 325i was tuned for about 50bhp more and it worked out at £24 per bhp. This was with a new intake manifold though.
My fuel gauge is not accurate.
Siphon the fuel out into cans. You could put it in another car to use it up. Your z will get nice fresh fuel after you have solved the gauge issue.
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