I used an online google sitemap generator to produce my sitemap. Will that ptoduce some fake impressions to my adsense statistics?
As far as I know, sitemap generators don't actually visit your site, so it doesn't actually make any impressions. It jumps from link to link via the pages stored on your server.
Depending on what sitemap generator you use. Chances are (most likely) it won't read js, just standard and php links. Since it's only reading stored pages, no ads are being served, and the link crawler is only running across js codes, so it just skips over it. Basically, you don't have anything to worry about is what I'm saying.
this will not even see your adsense links, nor will it see any other js links. bBut YES, it does actually crawl teh site, and not just jumps around on teh server