The graphs look normal to me and 46 mpg isn't horrible. Is that imperial gallons instead of US gallons? The 18" wheels and more powerful engine won't help fuel economy. Automatic transmission will also reduce fuel economy. Do you have quattro? That will also reduce economy. Driving style is also a major factor.
The hard starting could be related to faulty or dirty injectors. AWX engines are pumpe duse (PD) so it's possible it has camshaft wear if it doesn't idle well. This is how you check: http://www.myturbodiesel.com/1000q_how_to/multi/camshaftInspection.htm (the AWX is single overhead camshaft, SOHC).
Also check camshaft torsion as well. Let me know if it makes a difference - I've never noticed much. Here is how
http://www.myturbodiesel.com/1000q_how_to/multi/PD-adjust-Idle-TDI.htm
http://www.myturbodiesel.com/1000q_how_to/multi/PDadjustIdleTDI.htm
The hard starting could be related to faulty or dirty injectors. AWX engines are pumpe duse (PD) so it's possible it has camshaft wear if it doesn't idle well. This is how you check: http://www.myturbodiesel.com/1000q_how_to/multi/camshaftInspection.htm (the AWX is single overhead camshaft, SOHC).
Also check camshaft torsion as well. Let me know if it makes a difference - I've never noticed much. Here is how
http://www.myturbodiesel.com/1000q_how_to/multi/PD-adjust-Idle-TDI.htm
http://www.myturbodiesel.com/1000q_how_to/multi/PDadjustIdleTDI.htm