Relax! You'll be fine. I have an F650 as well and the cat has gone too to moggy heaven. aka the back of my garage.
Leaded or unleaded, she has burned the lot- before I changed my exhaust for a Staintune one, the OE did get severely choked and I experienced a very noticeable power loss hence the change needed.
If you head further south and buy fuel in bottles from stalls then worry more about water and other unmentionables in it. Your friend is a filter called Mr Funnel
look at the video) which separates water from fuel as well as other debris. Filters to 5 microns. Google it and consider getting the smallest one. Great kit and weighs little.
Last edited by Bertrand; 17 Sep 2013 at 15:14.
Reason: added video link