By either keeping track of all your kills with "Kills stats in an expanded format" on webpage and an excel sheet (this is what I did from my first tour on)
Or by using this nifty application programmed by Spatula:
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You can get it here: http://www.my2cents.co.nz/AKUAG/Resources.aspx
thax for that nifty tool, its quite cool,
i have 11,211, killz since my beginning.(tour 52) that's cool:)
plus i looked at my earlier scores, and found that i have definitely improved, on a tour from the early days, i compared a recent tour that has about the same amount of hours, and i got more than twice the amount of killz and less deaths, but my flying style has not changed.
finding this info was not as easy as you would think, I have had 7 handles, lol finding them all and what tour was a little time consuming.
but very cool anyways thanks again!!!