Cheaper by the Gallon

The US seems to have a problem with the concept of a gallon. In the UK a gallon is 4.546 liters. In the US a gallon is generally held to be just 3.785 liters. However, one DIY store has apparently redefined the gallon to be 3.43 liters. This creative approach to weights and measures could be adopted by petrol stations to offset the rising cost of a gallon at the pumps; an instant 10% reduction in price.