That’s probably what they’re trying to do. The better their quality management is the closer to consistently packing -1.95% they’ll be.

-2% is probably allowed and this is -1.95%. It’s okay I guess. I’d probably trust my cheap, regularly used and never calibrated kitchen scale less than I would trust these companies to comply with such rules.

That’s a perfectly normal number for any home that isn’t very new and perfectly insulated.

My 37sqm appartment needs approximately 5000 kWh in natural gas per year, 876 kWh last December, so 28 kWh per day on average. The building is admittedly old and not perfectly insulated but it’s also not a log cabin out in the open in Finland, but instead a flat enclosed within 3 other flats in the middle of cosy, never below -8C Germany.

21 kWh in a log cabin in Finnland actually seemed pretty low to me. It’s sort of obvious OP is using a heat pump and the cabin must really be absolutely tiny.