It's amazing to realise that you are talking in GALLONS.
Here in the UK we talk in LITRES and that makes a nonsense of the whole pricing business as many people don't have a clue what a gallon of fuel costs and the oil companies and the government regularly "con" the consumer.
Prices never come down more than one or two pence and then go up again very quickly.
Current prices for a litre of diesel are around 77pence a litre (£3.50 a gallon)and unleaded petrol is slightly cheaper but as the main method of haulage is by road the cost of living is severely affected by these exhorbitant prices.