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1·In comparison with gasoline, light oil has more light fraction components and better evaporation property, but it has a lower octane number, higher evaporation pressure, and lower calorific value.

与车用汽油相比，轻油中轻质馏分较多，蒸发性好，但辛烷值低，蒸气压高、热值较低。

2·Both them has lower ash and sulfur content, higher volatile matter and calorific value, lower ignition temperature and higher reactivity.

这两种煤具有低灰、低硫、高挥发分、高发热量、燃点低、反应性好的特点。

3·Faults: use fuel prices high, gas calorific value is lower.

缺点：使用燃料价格高，煤气的热值较低。