Despite intentions to shun this year’s Black Friday, the supermarket will treat customers anyway this weekend by knocking 4p off unleaded petrol, driving the cost down to 99.7p a litre. Diesel drivers can fill up for 103.7p a litre.Andy Clarke, Asda’s chief executive said: “We’re adding a further boost by investing in a three-day fuel price drop meaning drivers can now benefit … in the crucial run-up to the festive period.”The AA says average petrol prices have consistently been above a pound since October 2007.Edmund King, president of the AA, added: "Drivers filling up at Asda will get a temporary fillip as pump prices fall below one pound for three days.“Black Friday will help to put a smile on some driver’s faces but unfortunately the Groundhog Day feeling of seeing £1 per litre will be short-lived when the sub pound pump prices pass the pound mark again next week. Apart from marketing gimmicks pump prices haven't been below £1 per litre for five and a half years."Asda’s promotion is a further boost for drivers who saw fuel duty frozen in the 2015 Budget. Clarke called for the freeze to be extended into 2016.