Hi All, after fitting new plugs and air filter a couple of months ago my 1998 MB2 D14 1.4i was getting about 110 miles to £20 driving around town. But now, for some reason, the last twice I've put fuel in it's only doing about 67-70 miles to £20 before the fuel light comes on. According to an online fuel calculator I'm only getting 20 mpg. Does any have suggestions why this may be happening please? The car drives very well and I don't drive the car hard...and the only modification I have done is putting a set of 16" MG ZS hairpin alloys on it (and 205-50-16 tyres), thereby increasing the rolling radius by a mere 4.9%.
