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i normally drive for around 15-20 mins, on the motorway for about 15 miles ( thats to work mostly every other day) my mpg doing that would normally be around 27mpg , but like i say last 2 weeks, its dropped by 3-4mpg .... i havent had the chance to check the breathers yet due to the weather, they were cleaned about 6-7 months ago when my head gasket was done, would they get blocked again since then?

Cold weather will seriously affect MPG, car can take twice, sometimes three times as long to warm up.