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Message: <blockquote data-quote="teejay" data-source="post: 76463" data-attributes="member: 51">dont forget when you are filling in to top up....is it when you hit the red lights? or when the tank is really really empty? dont forget the red light means you about 10 lits of fuel ( just guessing for the E34, E30 has abt 8 lits, someone correct me if im wrong!) so its possibly correct that the second half( abt 30 lits )  would use up pretty fast compared with the first half ( 40 lits )or you could try something really daring, fill up a spare petrol tank,( this is used when you run out of petrol)  then drive around till your fuel runs out, then you actually see if the second half uses as much petrol as the first, my guess the second half will use less petrol i.e. more mileage, compared with the first half, coz more consumption due to carrying the extra fuel around town......xtracoolman,fuel gauge  is calibrated to the signal sent by the sending sensor to accurately measure the amount of fuel in tank, this info is also used by the OBC to calculate fuel consumption,how many more km/miles left before fuel tank goes empty, trip analysis-requires the OBC module, etc etc</blockquote>