That's all true of course but to say "LR during the winter does 200+ miles easily" would be better to come with some qualification. It was easily on your trip and will be on most similar trips in similar conditions. There will be times when it may not be "easily".
Unless you go up a mountain and don’t come down the other side, I’d expect a LR to never struggle to hit 200 miles even at faster than motorway speed (within reason)