Agree Simon. My rule of thumb for anyone not yet tried one is best case 90% (warm summer) down to 65% (winter, cold) of whatever the manufacturer claims to be the range. That should give a small margin or “reserve” as my old motor bike used to have. The effect of cold weather is far greater than I expected and something the manufacturers like to gloss over.

Agree Simon. My rule of thumb for anyone not yet tried one is best case 90% (warm summer) down to 65% (winter, cold) of whatever the manufacturer claims to be the range. That should give a small margin or “reserve” as my old motor bike used to have. The effect of cold weather is far greater than I expected and something the manufacturers like to gloss over.