Cut-price supermarket petrol causes higher emissions

Emissions of all regulated pollutants from cars are considerably higher when they are run on petrol without detergent additives, Shell claimed in October in the latest stage of its price war with the supermarkets. The increase in emissions appears to be large enough for regulators to look at the need to mandate the use of detergents.

The major oil companies have been engaging in an increasingly bitter price war with the supermarkets as their petrol sales have declined. Selling at 15 pence per gallon less than the average price at other filling stations, the supermarkets now have a 16% and rising market share.

In April, Shell became the first oil company to play a "green" card in the dispute, warning that cut-throat competition from the supermarket chains was reducing

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