“‘A pint of water weighs a pound and a quarter, a gallon weighs 10 pounds” pounded into me in primary school many years ago. It’s also why there are twenty fluid ounces in a pint. All UK measurements of course, USA gallons are different. 1 litre of water weighs exactly 1kg. Rounding errors in your conversion left you .0028lb out, not too shabby...
Yep, phone zombies, dogs, mobility scooters, prams and push chairs all seem to pass for cycles where I live. Not forgetting tree-root humps, potholes, brambles and nettles that add spice to the ride...
I chose to buy the COBI bike unit for my haibike instead. I’ve had it for about 3 months and I’m very pleased with it so far. The Satnav seems pretty good though I don’t use it often. It does integrate with Komoot for mapping as well as Strava for fitness.