Quickly tried and I got very different results compared to mine:
/**
* distance from this LatLng to a given LatLng
*/
G3.LatLng.prototype.kmTo = function(a){
var e = Math, ra = e.PI/180;
var b = this.lat() * ra, c = a.lat() * ra, d = b - c;
var g = this.lng() * ra - a.lng() * ra;
var f = 2 * e.asin(e.sqrt(e.pow(e.sin(d/2), 2) + e.cos(b) * e.cos(c)
* e.pow(e.sin(g/2), 2)));
return f * 6378.137;
}
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