Yep they are just economical pretty much all the time.. (atleast BMWs ones). I remember my 318d E90 never ever had to change it's mileage or distance to empty figure drastically... it just stayed there while my 28i's now is quite moody when you enter traffic it drops down so fast
Goes up when driving normal just the same luckily... still get pretty great mileage considering the extra power and sound though (35i muffler)
