I have a 3litre turbo diesel hilux and im only getting about 300-350km to a tank of diesel ive replaced the diesel filter but hasn't changed anything in the way of fuel consumption. Ever since I changed it it now starts like sh*t turns over for ages before starting and even then I have to hold the key on for a bit longer it let's out a big puff of white smoke then it idles like a bag of sh*t for about 30 seconds to a minute then all of a sudden runs fine