Bad De-Mandate?

[Signature620]

The ecm file will be trash if it's got a Borg Warner turbo on it. You should really change it to some sort of Holset turbo, whether it be a wastegated HX55/60, stock VGT or a slightly larger VGT.

The poor fuel economy probably isn't totally caused by the crappy tune. Try pressurising the intake to check for boost leaks. Check the aftertreatment system has been hollowed out correctly, check for dirt and bugs plugging the CAC, check that the EGR piping has been blocked off correctly, check that the exhaust gas pressure sensor is reading correctly and replace the intake pressure sensor if it has carbon all over it.