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    6.9 fuel economy after turbo add and fuel screw increase

    Just put a factory ATS turbo on my 86 6.9 with c6, 3.54 diff, 3" exhaust, running waste veg oil diesel blend. I turned up the IP fuel screw almost a full turn. Gray haze at WOT. No coal rolling. Still not getting much better than 15mpg. If the fuel screw is turned up too much, could I be...

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