i recently changed my mafs for a new one ...there was nothing wrong with the old one (140,000 miles !) , i just got hold of a brand new item for less than 100 quid , so thought it worth the money . I have used 4 tanks of fuel since and managed to get 335-40 each time which is up 40 on usual !! ...This is normal driving which is a mix of motorway , town and full beans ! ...so seems the new mafs was worth it :woohoo: