Only minor hypermiling (Occassional P&G on highway, engine-on coasting while trying to not upset any fast and/or furious drivers following me, upshifts at 1500rpm)
Fixed leaky fuel pump
Needs rear wheel bearings.
Never gets even close to middle on the temp gauge. Possibly the thermostat stuck open? Possible gains?
Always refill at first fuel station after fuel light comes on, always takes 29.8-30.0L until full. I do not fill the expansion tank.
Lighter wheels, high tyre pressure
Not Eco, performed by previous owner:
Higher boost, higher fuel supply when on boost (hence upshifts at 1500rpm, to avoid boost), Big exhaust. I don't know the new boost/fuel figures, but it's much livelier and faster than stock GT TDis.
GT TDi "mini-Kammback" spoiler, perhaps lowering, further adjustment of nut behind wheel without going to extremes.