My car uses a lot of fuel warming up.

[woodisgood]

1989 325i
All stock everything.
Tonight my windshield was frosted over pretty good, let it run at idle for 20 minutes or so, maybe a little more. Needle dropped almost1/4 tank. I remember this happening a few times last winter in the same circumstances. Anybody else notice this?

[Swanny]

Did it ever rebound? Mine would do something similar but would eventually get some back from the return system. Thought i was going crazy for a little bit because my gauge would fluctuate quite a bit on very cold mornings.

[DÌEGØ]

Thats a lot of fuel. I would check the sending unit/gauge and coolant temp sensor.

[jlevie]

I can't see any engine burning a 1/4 tank (3.6 - 4.1 gallons) of gas in 20 minutes. this is more likely to be a gauge/sensor problem.

[bastianshaw]

what part of the guage are you reading 1/4 tank from it isnt linear

[bastianshaw]

the only sure way is to top off let it warm up then refill