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Experiencing something of a heatwave at the moment, up around 29C yesterday, with correspondingly great FE! I've noticed a significant gains driving the tdi hard during the pulse, possible to get over 100MPGimp/90MPGus, working the pulse to make the most of hills (pulsing up, coasting down). 5th gear gives better FE than 4th for the same P&G regime. Low revs, lots of torque, burn it hot, burn it hard. Just watch out for compressor surge, if you have some diagnostic software you can measure boost vs rpm to find how hard you can push it by comparing the measured curve with a compressor map.
Steady state driving best is up the the 80sMPGimp/70sMPGus so still good, not awesome but much more practical.
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