Damn, outdated data is not that helpful. I sent an email to the site owner, as the monthly updates charts are updated with today's date, showing stations added or removed, but not which ones - I asked him if that info is available.
In the About section, this is noted:
Who maintains the data on this site?
YOU DO. The station listings on this site are added, updated and removed by users like you. However, I'd like to thank Jonathan Lathbury, who posts comments regularly, for his hard work tracking down phone numbers, updating GPS coordinates, and doing other things to improve the quality of the pure-gas.org listings. Thanks, Jonathan!