Average MPG possible issue because of rain????
Try driving out of the "groove" basically drive with one set of wheels in the center of the lane and one set on the line. There is less water there to push out of the way. Call me crazy but if you look hard enough you will see a difference.
In the north I know we get a winter fuel blend that will give worse fuel mileage then the summer blend does .... that might be part of it . Mines goes down when it's colder out just cause it sits and idles longer to warm up .... Idle time brings the MPG meter down pretty quick .
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From: South Charleston, WV
I just drive in the tracks of the big trucks. Leaves me plenty of room.to make sure I don't hydroplane as easy when I'm going 65+mph down the interstate, plus it doesn't feel like as much drag on the car.
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From: Rio Rancho NM
Try this. Next time you drive this route, put her into nuetral and coast. See how long it takes you to drop 10-15 mph and then go back to driving. Then, when it's raining like it has been do the same thing and see how fast your car slows down. That'll tell you the difference in resistance between wet and dry. It won't be totally accurate but it'll give you an idea.
Joined: 12-23-09
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From: Mt. Pleasant S.C.
Rain most definitely cases lower MPG. More rolling resistance, more air drag, cooler tire temps, tires pushing water, it all adds up to a significant measurable degree.
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From: vancouver
Never believe that digital MPG ****. its never correct.
i fill up 43 liters every time right when it hits red. and I only manage to pull 400km/tank city+hwy.
doing the math thats 10.75L /100km.
my digital eco displays 9.1/100km. wheres that extra 1.6L/100km gone to?
and yes i reset the eco display every 2 tanks.
i fill up 43 liters every time right when it hits red. and I only manage to pull 400km/tank city+hwy.
doing the math thats 10.75L /100km.
my digital eco displays 9.1/100km. wheres that extra 1.6L/100km gone to?
and yes i reset the eco display every 2 tanks.
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Joined: 12-11-07
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From: Albany, NY
Never believe that digital MPG ****. its never correct.
i fill up 43 liters every time right when it hits red. and I only manage to pull 400km/tank city+hwy.
doing the math thats 10.75L /100km.
my digital eco displays 9.1/100km. wheres that extra 1.6L/100km gone to?
and yes i reset the eco display every 2 tanks.
i fill up 43 liters every time right when it hits red. and I only manage to pull 400km/tank city+hwy.
doing the math thats 10.75L /100km.
my digital eco displays 9.1/100km. wheres that extra 1.6L/100km gone to?
and yes i reset the eco display every 2 tanks.
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Joined: 10-17-07
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From: vancouver
car says : 9.2/100km = 9.2*4 / 100*4 = 36.8 / 400km
Actual: 43/400km = 43/4 / 400/4 = 10.75/100km
edit:
now that i re-read your thing, metric (what we use in canada) is X LITERS / 100km...not X KM / liter which is imperial Miles / Gallon
Last edited by ijak; Dec 9, 2011 at 12:39 PM.
I has no idea how you are calculating that mileage. Im pretty sure it is miles driven/ fuel volume used. Please explain your math.
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Joined: 09-14-05
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From: Phx, AZ
Hi guys,
I've posting this thread because I've been having a concern about my AVG MPG that I don't know if I should be concerned about it or not, that's why I want to share to see if the same is happening to some of you.
Twice a week I drive to a clinic for working reasons which it is about 60 miles away my job's headquarter.
My Avg MPG meter shows between 30.2 and 30.9 (usually 30.5 mpg) when it doesn't rain, I always check it when I arrive. The last 2 times that it rained (the last one was today) I've noticed a significant drop of avg MPG.
The first time I thought that maybe I drove differently from usual by pushing a little more than usual, but today I drove just the same as when it doesn't rain to see if the result was the same.
When I arrived, I've checked it and it said 24.3mpg just like the previous time (the previous time was actually 24.5mpg).
Now, everything was the same as when I drive with no rain, such as outside temperature, traffic condition and the way I drive.
Is it something I should be concerned about? I mean, droppign of about 6 MPG just because of the rain? Does it sound right or it may be the beginning of some kind of problem?
I have the AEM filter that came with the AutoWerks kit, it is not a CAI.
Thank you guys for reading this thread.
Christian
I've posting this thread because I've been having a concern about my AVG MPG that I don't know if I should be concerned about it or not, that's why I want to share to see if the same is happening to some of you.
Twice a week I drive to a clinic for working reasons which it is about 60 miles away my job's headquarter.
My Avg MPG meter shows between 30.2 and 30.9 (usually 30.5 mpg) when it doesn't rain, I always check it when I arrive. The last 2 times that it rained (the last one was today) I've noticed a significant drop of avg MPG.
The first time I thought that maybe I drove differently from usual by pushing a little more than usual, but today I drove just the same as when it doesn't rain to see if the result was the same.
When I arrived, I've checked it and it said 24.3mpg just like the previous time (the previous time was actually 24.5mpg).
Now, everything was the same as when I drive with no rain, such as outside temperature, traffic condition and the way I drive.
Is it something I should be concerned about? I mean, droppign of about 6 MPG just because of the rain? Does it sound right or it may be the beginning of some kind of problem?
I have the AEM filter that came with the AutoWerks kit, it is not a CAI.
Thank you guys for reading this thread.
Christian
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Joined: 12-11-07
Posts: 568
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From: Albany, NY
LOL u check your math.... im asian i dont get my math worng, maybe speeling
car says : 9.2/100km = 9.2*4 / 100*4 = 36.8 / 400km
Actual: 43/400km = 43/4 / 400/4 = 10.75/100km
edit:
now that i re-read your thing, metric (what we use in canada) is X LITERS / 100km...not X KM / liter which is imperial Miles / Gallon
car says : 9.2/100km = 9.2*4 / 100*4 = 36.8 / 400km
Actual: 43/400km = 43/4 / 400/4 = 10.75/100km
edit:
now that i re-read your thing, metric (what we use in canada) is X LITERS / 100km...not X KM / liter which is imperial Miles / Gallon
But really, the dic is always close in mine. I dont let my car warm up more than 10-20 sec when cold, so that could be part of it as letting it idle to warmup seems to really bring down the mpg, or l/100km.
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Joined: 07-06-11
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From: indiana
well i only read about half the first page then scrolled down to comment, OP i have the exact same situation. i have a K&N sri....i have checked the filter before too and it doesnt seem wet but i bet some water/water vapor does get in. i notice about a 4-6 mpg drop at highway speeds.
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From: indiana
oh ya forgot to mention ive witnessed this idk how many times. the aftermarket intake worsened the issue, with stock it was only 2-3 mpg. it is deffinatly rain that causes it.........dont think there is much you can do about it but deal with it.
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From: Phx, AZ
An aftermarket intake is designed to allow increased cool air flow but will further exaggerate the issue since the air coming in will be much cooler than if stock.
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Joined: 02-09-09
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From: Tejas
I agree with the water resistance and engine efficiency comments.
Additionally, rainy weather means more humidity in the air (obviously) and thus a higher density altitude, meaning the engine has to do more to get the same power output. In addition to this, the change in humidity, pressure, and temp causes a change in fuel trims and air metering in general. This affects not only true mileage but also how the DIC mileage is calculated (since it's calculated). I would go off of the old fill-up-the-tank-and-calculate method over the DIC and see. It's the only way to be sure, and honestly the only thing that truly matters anyway, not what the DIC tells you.
Additionally, rainy weather means more humidity in the air (obviously) and thus a higher density altitude, meaning the engine has to do more to get the same power output. In addition to this, the change in humidity, pressure, and temp causes a change in fuel trims and air metering in general. This affects not only true mileage but also how the DIC mileage is calculated (since it's calculated). I would go off of the old fill-up-the-tank-and-calculate method over the DIC and see. It's the only way to be sure, and honestly the only thing that truly matters anyway, not what the DIC tells you.
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Joined: 07-23-10
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From: Carlsbad, CA
Hey Christian,
I have been having sensor issues related to humidity all the time when it rains. I logged it on HPtuners and it shows like 10-15lbs more airflow at the MAF when its damp... it leads to a rich state... which leads to shitty fuel economy. Just my opinion and observations.
I have been having sensor issues related to humidity all the time when it rains. I logged it on HPtuners and it shows like 10-15lbs more airflow at the MAF when its damp... it leads to a rich state... which leads to shitty fuel economy. Just my opinion and observations.
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Joined: 07-23-10
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From: Carlsbad, CA
For me, not worth it... Southern California has the best weather around... the weather gods are scared of our last governor... he would terminate them if the weather sucked.
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