My name is Theo. Just bought my second BMW, a 635d, which I'm very pleased with. However, I'm very disappointed with the MPG so far and think there may be an issue affecting it. BMW claim 30 around town, but even when driving very conservatively I'm struggling to get 19/20mpg. I know manufacturers tend to overestimate but this seems very low. Since getting the car 3 months ago I've done about 2000 miles and my average is 27mpg, which is mostly around town with some motorway stuff in there. Ive had a 118d before and this was getting 47 around town, so 20 is terrible. Previous to this i had an Alfa 159 1.9 diesel and when i first got it it was doing only 27 around town. Turned out the thermostat was jammed open and as soon as this was fixed the mpg went up to about 38 around town, so I'm wondering if there is something similar going on here.
Anyone's thoughts would be much appreciated.