The cost of petrol and diesel will be cheaper for those filling up at Tesco and Asda from tomorrow, but Morrisons and Sainsbury's won't be cutting prices at the pumps.
E.on is to hike energy prices by an average of 3.7% from 18 January, becoming the last of the big six power suppliers to announce an increase in its charges.
Motorists have been given respite from rising petrol prices after Chancellor George Osborne announced an extension to his fuel duty freeze until May 2015.
Households are to be spared the full force of recent bill hikes after power firms pledged to pass on savings from a Government shake-up of energy levies.
Water group United Utilities is scaling back next year's planned price increase after hitting households in north-west England with a 4% hike earlier this year.