Avgas quarantine in Canada
It looks like the producer of Canadian avgas has a quality control concern, and the result is that national supplies are being quarantined. So if you're coming up to Canada from the US, check that you can get fuel where you're going before you go. Notam from TC in Ottawa:
180001 CYHQ NATIONAL CYHQ POTENTIAL QUALITY ISSUE OF FUEL 100LL (JET A NOT AFFECTED) DISTRIBUTED BY IMPERIAL OIL (EXTENT UNKNOWN) VERIFY LOCALLY FOR AVBL 1802160008 TIL APRX 1802231800