2 added 70 characters in body
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How To Train Your Dragon didn't go into specifics, but the "monstrous nightmare" breed used a liquid as its fuel, so this is all quite plausible (if, y'know, you suspend disbelief that fire-breathing dragons exist). As for "how":

The dragon has a rudimentary biological refinery; bacteria in its gut ferments any cellulose it eats into ethanol or methanol. The dragon's intestines absorb these alcohols as well as the fats from its diet, and transport both to a gallbladder like organ above the stomach. When the fat and alcohol react here, the product is very similar to diesel fuel. The dragon can essentially vomit this cocktail of fuel oil and half-reacted fat and alcohol, which self-ignites under such pressures, at its enemies.

You don't need a Ph.D in fantasy biology to come up with something plausible.

How To Train Your Dragon didn't go into specifics, but the "monstrous nightmare" breed used a liquid as its fuel, so this is all quite plausible. As for "how":

The dragon has a rudimentary biological refinery; bacteria in its gut ferments any cellulose it eats into ethanol or methanol. The dragon's intestines absorb these alcohols as well as the fats from its diet, and transport both to a gallbladder like organ above the stomach. When the fat and alcohol react here, the product is very similar to diesel fuel. The dragon can essentially vomit this cocktail of fuel oil and half-reacted fat and alcohol, which self-ignites under such pressures, at its enemies.

You don't need a Ph.D in fantasy biology to come up with something plausible.

How To Train Your Dragon didn't go into specifics, but the "monstrous nightmare" breed used a liquid as its fuel, so this is all quite plausible (if, y'know, you suspend disbelief that fire-breathing dragons exist). As for "how":

The dragon has a rudimentary biological refinery; bacteria in its gut ferments any cellulose it eats into ethanol or methanol. The dragon's intestines absorb these alcohols as well as the fats from its diet, and transport both to a gallbladder like organ above the stomach. When the fat and alcohol react here, the product is very similar to diesel fuel. The dragon can essentially vomit this cocktail of fuel oil and half-reacted fat and alcohol, which self-ignites under such pressures, at its enemies.

You don't need a Ph.D in fantasy biology to come up with something plausible.

1
source | link

How To Train Your Dragon didn't go into specifics, but the "monstrous nightmare" breed used a liquid as its fuel, so this is all quite plausible. As for "how":

The dragon has a rudimentary biological refinery; bacteria in its gut ferments any cellulose it eats into ethanol or methanol. The dragon's intestines absorb these alcohols as well as the fats from its diet, and transport both to a gallbladder like organ above the stomach. When the fat and alcohol react here, the product is very similar to diesel fuel. The dragon can essentially vomit this cocktail of fuel oil and half-reacted fat and alcohol, which self-ignites under such pressures, at its enemies.

You don't need a Ph.D in fantasy biology to come up with something plausible.