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Heating oil produces 138,500 British thermal units per US gallon (38.6 MJ/l) and weighs 8.2 pounds per US gallon (0.95 kg/l). Number 2 fuel oil has a flash point of 52 Â°C (126 Â°F). Most heating oil products are chemically very similar to diesel fuel used as motor fuel.
This month, when I got my bill, I saw that the price was $2.10 per gallon. The absolute change in the price of heating oil during that month was. 2.10  1.99 = 0.11 $ per gallon. We say that the price of heating oil increased by 11 cents that month. You can also use percentage change to describe change. To calculate the percentage change: find the absolute change, then divide that number by the original amount.