IO540: I use
commercial reserves - even when flying a PA28. I.e, 5% contingency fuel, plus enough for a go-around, 30 minutes "holding" fuel, and a diversion to a suitably planned alternate. A bit like an airliner's Computed Minimum Reserve if you will. It usually ends up at around 7.5-8 US Gallons (depending if it's a
Cadet, a
Warrior or an
Archer) leaving about 4 hours' endurance (even without leaning). That still allows to fly beyond Le Touquet.
Cheers
