As the temperature rises, petrol expands and the amount of energy in each gallon drops. Since petrol in the US is priced at a 60F (15.5C) standard, and the pumps do not adjust for temperature changes, drivers get less bang for their buck in summer.
Consumer groups say the temperature rise could cost motorists up to 9 cents (4½p) a gallon at the pump. Overall, that means American drivers paying a total of more than $1.5 billion (£750 million) extra in hot weather, says a Congress sub-committee that has addressed the issue.
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