I knew my car was a gas guzzler but COME ON!

[McWatters]

alright, so im driving back from parry sound. ( about 2 hours from where i live) and i notice that my gas is getting lower every 3 - 5 min. and its a noticable difference. I was averaging speed of 120. but the gas just seemed to be poooouring out.. got home let my car sit for a good 2 hours. Checked for a leak, Nothing that i could see. Ill check again in the morning. Soo what the hell is goin on. i Bearly made it home from parry sound. One the drive to Parry Sound , gas was great. so im really confused.

anyone take a guess???



J.McWatters

[Nick.Hay]

Dunno...

My 535i has just ticked over 207k kms, and is using 21.5L/100km

****. Although it may have something to with the dodgy spark plug leads.


Maybe fuel filter, dirty injectors, not sure...

[liquidtiger720]

120mph or km/h?

@ 120mph,....I get something like 8mpg or less.

[Blitzkrieg Bob]

How many miles or km was that?

if I drove at 120km for two hours that would be about a 1/4 to 1/3 tank

Now...if I was driving 120mph well thats more like 3/4 tank

[fujioko]

120 MPH??... wow!.. If that is correct, then your car should have sucked down a lot of fuel.

Basic aerodynamics. The resistance to air starts to grow expedientialy after 40 MPH. That is to say it takes a tremendous amount of power to push a car at 120 MPH.

For example it takes an average of 8 – 10 HP to propel an auto at an even speed on a flat surface @ 35 MPH. Once you pass the 40 MPH threshold the power needed to push the car increases. The required increase in power is non linear and if plotted it would resemble an expediential curve. A quick estimate on an e34 indicates it requires about 124HP to move the auto at 120mph…. incidentally it would require 576hp to move the auto at 200 mph.

My math could be off a bit but the physics are real.

That’s my 2 cents.

[Toomas]

So you drove at 120km/h for four hours, its 480km.
My 535 would drink ~50 liters during such trip and thats only if i dont stop or pass traffic but if i did i would consider ~60 liters.
But from your post its not really possible to understand how much fuel yours drank.

[Qube]

at 120KPH, the OBC reports using about 9L/100KM. I find that to be the optimum speed to run at. 100KPH sucks just under 10. Watch the OBC for the numbers... Test 7 for the MTL I believe.

[ghost_ryder35]

from canada I see. Glad to hear its KM instead of MPH.

[ghost_ryder35]

just another thought, does the car idle fine, start up fine? Might be a leaky injector, or a way past due fuel filter.

[McWatters]

car has hunting idle when it feels like, starts fine. fuel filter most deffinately is the first thing then




J.McWatters