Cold and up hills is a drag...have a strong coolant heater so it starts at operating temperature (I have 1500 watt, tank type heater meant for tractors and heavy equipment, at start up I watch the temp drop when its really cold). Let the clutch out in first, then second (no throttle), slowly add power, shift to third asap, anticipate the traffic lights and volume so you never need to slow down or brake, momentum is key especially with hills involved, single lane roads make it very hard/challenging but all in the name of FE. I could always get under 4L/100kms on my Passat tdi (B4), sometimes 3L staying under 80km/h on real back roads/gravel. Just be happy you have a diesel, gas engines really hurt when cold and working hard!
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