Short answer, a half pint of gasoline. Why fool around?
Long answer - depends on the season.
Right now in central Brazil it is dry season. The nights are cold, 50's and breezy so you do need a fire for warmth. Even in dry season when we have a cold front come through we can get night rains so hypothermia is a real danger. Fortunately everything is bone dry so much so that there is a real risk of starting a brush fire. Making a fire is not the problem as there is ample fuel and tinder available and it readily bursts into flame with little provocation.
Rainy season (Nov - Feb) is another animal entirely. It will rain almost constantly for up to a month at a time and even standing deadfall is soaked through. Nights are also cool (70's) and wet and hypothermia is still a risk if you are soaked and there is a breeze.
Prepared tinder in such conditons is a survival pack essential. It can be very hard to find dry tinder as even the stuff out of direct rain has absorbed humidity and won't light easily. I will usually pack a pair of 5 inch citronella candles, these get used for light and bug control as well. I also use PJ treated cotton balls wrapped in foil. These work very well, are easy and inexpensive to make, and pack well.
Preparing the fuel is important in rainy season too. You have to know how to identify which types of wood don't get waterlogged easily or at least find some wood that was protected from the rain if possible. Baton, split, scrape, shave, and make fuzz sticks, as necessary.
It isn't necessary to "knife" all of your fuel supply, just make a little more than enough to get a fire going and the heat will do the rest of the work for you. Time is important in the bush and your time is better spent on other essentials than playing with your knife and firewood, provided you generated enough fuel to get things going.
In wet weather, exaggerate the proportions of kindling and tinder necessary. I try to collect a really healthy supply of pencil-sized kindling and strip off any wet bark with my knife. Don't get frustrated if your first attempts fail. Your first attempts will begin to dry the tinder so keep using the same stuff as long as the dry parts are catching fire. Even using a candle it has taken me up to a half hour to get a fire going to the point that it will dry it's own fuel.
In such conditions the candle or a ball of PJ treated cotton really speeds up the process.
NOTE: Can we adopt a standard abbreviation for Petroleum Jelly Treated Cotton Balls? Maybe PJTC?:thumbup:
Mac