Thank you Sarcs. For your explanation.
The Sunfish VFR flight planning skills are rudimentary at best. I barely understand the concept of alternates, tempo, inter and Octas so if it's dodgy I don't go and I always load full fuel and plan to use less than half. The few times I have had to consider/weight/range/alternates etc. normally takes me a day or Two to work through.
..But then I'm paying the bills myself and I don't have the commercial pressures that you guys do...