Something can't be right!
 

Look at milage 10 miles to the gallon. Its fast but not a Lamborghini something must be wrong. Any ideas?

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Just went down to 9.9 omg. Gas is like 4 dollars.! I just try not to think about it lol. But I need to know if something is wrong.

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heavy suv + stop and go traffic = shitty gas mileage

With a hundred-mile and a five-hundred mile road trip behind me I'm averaging about 12 mpg over the past 6 months with 3800 miles behind me - over 3k of that is stop and go traffic, so go figure...

Tough to say, I can't tell what engine you have but my 4.4 averages about 16.5-17.5 in town as long as I behave and about 21 mpg freeway. If your rolling a 4.4 as well I Would think about the pre cat O2 sensors if they have 80k+ on them.

im getting 15 in my 2001 4.4. check your sparkplugs, fuel filter, coilpacks, oil. check your tire pressure and has it been aligned lately.

Must be you trying to listen to that new xpipe :D

Im sorry that is way too low. Something inst right. I drive with a heavy foot and I avg between 16.5-17.5. 2005 4.4..

Inner city will get you 10-13 and i imagine in Miami traffic sucks. I get 16-18 in a mostly country setting.

Honestly have never seen mine below 15mpg. I sit in fairfield county traffic on I95 for 70 miles a day too..

:thumbup: Agreed - everyone has their own interpretation of what 'city' driving is.......10ish mpg is pretty normal for me for inner city Boston driving.
I would be more worried about a change in mpg for the same route/driving conditions.

Something is wrong, however it depends on where/how you drive, in NYC i avg around 13, since i've moved to CT it's more like 17.0 (city driving).
19 is the most I have seen on the highway. (2005 4.8is)

i drive all street mostley here in miami very rare that i get on highway and traffic does suck alot.. also i have been a little heavy since putting the x pipe but the diffrence was 10.6 without x pipe and now 10.0 with x pipe. i was thinking about getting some fuel cleaner and some other crap thats suppose to help. also was thinkin of putting a stage2 intake as thats suppose to help.. but yea. also tire pressure does it make that big a diffence i have not checked them at all ever lol they look full lol. so after every one comment im thinking i need to change some stuff. and the engine is the m62 4.4:dunno:

it does sound good lol. i have a habbit now of reving it every time i turn it on lol my girl says it sounds like i have a challenger outside lol

so you have seen yours go that low before?

no same route every day. work, home, food, gas... but it has been like this since i got it in november. just had to ask as gas is getting pricey 10 to the gallon is kind of crazy

Doesn't seem like much is wrong considering that the display also shows the average speed under 13 mph.

Calculate it on full tanks to get a more accurate reading than short intervals on the OBC.

Doesn't "Consumpt." in the display mean consumption, which is usually liters/100km? Mileage is the inverse of consumption. I guess either way 10.0 is an unusual value as 10 liters/100km is way to good.

my experience is that the on board computer lies about economy, you have to do your own calculations

ive tried and its worse lol

x2 on changing the O2 sensors. Those effect A/F ratio and resulting gas mileage will plummet if not working correctly.

My 4.4 has about 106K miles....totally stock engine (original plugs, O2 sensors, etc) and I'm seeing an average of 16pmg in heavy traffic. And I have a lead foot. My MPG only drops below that if I'm in hilly terrain or really bad winter weather.

The only way it can "lie" is for the variables to be incorrect. In otherwords, the input signal from the O2 sensors, MAF, and other sensors are not working correctly.

It's a computer and algorithms. It is incapable of lying. :confused:

Okay going to look into new o2 sensors. Is that a diy?



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I had a similar issue. I normally get about 12-14 city, and 19-21 on the highway. Ive gotten 22 on the highway if I go 70mph with cruise control on.

A few trips back, heading to Vermont, I was getting under 18mpg with cruise control on. I have made this drive many times, and I usually get 20+. I even reset the counter, thinking it might be off or whatever.

The Fix: I got half way, stopped for gas, turned the car off, and back on, and started getting 20+. Not sure what it was.

My 3.0i does 15.5 round town and 17.5 when I hang the caravan on .? .
By the way an English Gallon of petrol ,4.5 litres, is $10.38 in england now. (£1.40 a ltr.)

so i think what was said before is correct if my avarge speed is only around 13 dont know how thats possible but w.e lol then i can expect more than that in gas milage 10 would be fair if im going only 13 miles an hour... no am i going 13 miles an hour hell no lmao:nanana:

2001 X5 4.4, average for me is 15 city, 18 hwy. The kind of driving you do can lead to wet tail.....water build up in the cat converter.... Just maybe that might be a factor. Just an idea....might be stupid......I don't know for sure is what I am saying!

I once let my car sit for 20 min with the engine running and got 0mpg :yikes:

j/k...if you think there may be a problem hop on the highway and see what you are getting at a steady 60 or so for some time - only way to normalize it Vs. the opins from others as to what is 'average for city driving'.


BTW, just got back from SOBE.....lotta fun as always but the liver still hurts from excess libations at the Fontainebleau/Delano/W/Shore club

dskyers do you let your X idle for long times before driving it?

-Cyrus

yea i do that alot. i dont know if you want to hear why lol two reasons. im a smoker take that how you want lol, second im scared my battery will die becuse of the two tens i have in car. when i first got the car it died i think i left the lights on but now i never let it sit off. is that my problem as i do that alot to be honest. if im in the car its on. could that be it

That could definitely be it. Try a tank without warming up more than 15-30 sec.

the reason i said that the on board computers calculation of fuel economy is incorrect (lie)

is that from personal experience and as has been discussed before in this forum that is the case , it is highly optimistic in its calculations.

in my case the computer claims fuel economy of 8.1 litres per 100 (diesel) however if you do the calculations your self i get 9.1 litres per 100, or 9.4 per 100 when using the A/C.

i use my car for work and keep detailed records for tax purposes and can assure you that these figures are correct,

so again the onboard computer lies

I'm averaging 10.1 litres per 100km (onboard computer) with my 3.0 diesel.
I drive daily, mainly city (like 95%).

I think that's pretty impressive for almost 2,7tons heavy car.
Something must be wrong or you floor every light, haha.

While I accept your information on your own measurement difference, it isn't necessarily a widespread characteristic that the OBC reads out incorrectly. Mine has a maximum error of 0.2 l/100 km, based on filling it each time and measuring mileage. I have checked it on five BMW models that I have owned, and this has been typical. Maybe the diesel model has some additional variable.

There is always the possibility that your fuel pumps are not accurate, unless you use a different one each time and get the same delta.

obviously i cant be sure about fuel delivery pumps however i always fill it full and generally at the same cost, allowing in cents per litre variations

however what i really wanted to impress upon the OP was that you need to do the calculations your self and not rely on the obc for your determinations of economy

Okay I'm going to let go all the way down. Fill up and see where it goes and thanks for the info

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