My in Town / City mileage is similar to yours with same mods. Keep in mind the EVIC over estimates so you are actually getting better in reality. Depending on tire size I see from .5L to 1L/100km difference when hand calculating. Consistently .7L/100km with my summer tires. Stock size I was seeing 1L/100 difference.
2007 WK CRD QDII, GDE HOT tune. 275/55/18'' on Sahara's, SRT8 suspension.
2000 Jetta TDI (hers)
2006 Liberty CRD (sold)
3 VW TDI's (sold)