One trick you could use here would be to stash the value into the Highcharts options:
$('#container'+i).highcharts({
myData: car,
plotOptions: {
series: {
cursor: 'pointer',
point:{
events: {
click: function(event) {
alert(this.series.chart.userOptions.myData);
}
}
}
}
},
Here's a fiddle.