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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N57 / M57 Turbo Diesel Discussions - 335d > MPG Observation JBD 100% vs 0%



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      08-30-2013, 07:20 AM   #1
Mark M
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MPG Observation JBD 100% vs 0%

Heard from a friend.....

- Measured two tanks of fuel back to back from the same fuel station, tire pressures remained the same. Driving style remained the same.

1st tank of fuel:
JBD at 100%
Used AC 20%
Achieved hand calculated 32.1 mpg, on 15.28 gallons = 490 miles driven.
(OBC reported 35.6 mpg)

2nd tank of fuel:
JBD at 0%
Used AC 20%
Achieved hand calculated 34.3 mpg on 15.25 gallons = 523 miles driven.
(OBC reported 36.1 mpg)

Last edited by Mark M; 10-25-2013 at 03:24 PM.
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      08-30-2013, 08:42 AM   #2
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I strongly suggest you get a bigger IC for that matter and you will regain mpgs on HWY. I know I have made some mods i.e RENNtech/WAGNER IC/Air scoops and Im getting 21-23 city mpgs, its hard to get hwy mpg's since there TOO many vheicles here in the island but I once clocked over 44 mpgs at 70-75 mph at a short distance of 20 miles with A/C on. good luck on this.
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      08-30-2013, 08:44 AM   #3
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That is strange, i have opposite issue with my OBC. It always shows less MPG than actual. I use fuelly all the time.
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      08-30-2013, 08:48 AM   #4
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Quote:
Originally Posted by Puerto Rican 335d View Post
I strongly suggest you get a bigger IC for that matter and you will regain mpgs on HWY. I know I have made some mods i.e RENNtech/WAGNER IC/Air scoops and Im getting 21-23 city mpgs, its hard to get hwy mpg's since there TOO many vheicles here in the island but I once clocked over 44 mpgs at 70-75 mph at a short distance of 20 miles with A/C on. good luck on this.
If the only reason to get FMIC is to gain 4MPG, you would need to drive the car for 4years before you see any savings. Simple math
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      08-30-2013, 08:51 AM   #5
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Plus I wonder how much of an affect our sooty intake charge air has on the intercooler. In theory, a new OEM intercooler would perform better than a 40k mile used OEM intercooler due to less sooty oil residue across the chambers. PR 335d, do you have any pics to show the inside of the intercooler you removed and the level of buidup within?

Last edited by Mark M; 08-30-2013 at 09:17 AM.
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      08-30-2013, 09:11 AM   #6
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Crazy I for one am looking for performance since MPGs here are hard to come by, Im using this as a referance for those of you in the states!!!

Mark GREAt question i still have the oem(at home) IC I will take photos of it ok and post
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      08-30-2013, 09:25 AM   #7
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You really should run through 3 tanks at each setting and take an average.

2.2MPG could be within the margin of error just based on differences in driving conditions.
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      08-30-2013, 11:29 AM   #8
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Quote:
Originally Posted by crazyinp View Post
If the only reason to get FMIC is to gain 4MPG, you would need to drive the car for 4years before you see any savings. Simple math
def not the only reason, but certainly a benefit that is large enough to factor in to your decision
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      08-30-2013, 01:24 PM   #9
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Well said amigo Hooper , I bought the WAGNER IC for the power i would get and LESS heat soaking 335's in general(Gas and DIESEL models) go through. MPG's is an extra
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      08-30-2013, 01:25 PM   #10
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I hand calculate every tank. I did not notice any appreciable difference when I went from no JBD to JBD 100 pct. If anything, higher with. Today I took the JBD off for an upcoming dealer visit. We shall see. Doubt much difference will occur. On a recent road trip I was getting 39-41 mpg.
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      08-30-2013, 04:25 PM   #11
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My OBC MPG is the same as manual calculation.
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      08-30-2013, 06:28 PM   #12
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I just got 38mpg hand calculated.

578 miles on 15.23 gallons of diesel. All highway from the end of new jersey to myrtle beach. Car is completely stock, sports package RFT tires too.
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      08-30-2013, 07:59 PM   #13
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Quote:
Originally Posted by crazyinp View Post
That is strange, i have opposite issue with my OBC. It always shows less MPG than actual. I use fuelly all the time.
Me too. My OBC is 2-4 MPG Lower than actual.
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      08-31-2013, 09:08 AM   #14
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My HAND calculations have always been HIGHER than the OBC. Just yesterday when I filled up, the car said 26.4 mpg, and my math said 28.x. This has never been different since I've owned the car, and its had the JBD at 100% since three weeks after I picked it up.
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      08-31-2013, 09:27 AM   #15
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Quote:
Originally Posted by Puerto Rican 335d View Post
I strongly suggest you get a bigger IC for that matter and you will regain mpgs on HWY. I know I have made some mods i.e RENNtech/WAGNER IC/Air scoops and Im getting 21-23 city mpgs, its hard to get hwy mpg's since there TOO many vheicles here in the island but I once clocked over 44 mpgs at 70-75 mph at a short distance of 20 miles with A/C on. good luck on this.
FWIW I have seen no mpg changes to the positive since installing the Wagner. If you are, I would suspect it is because of your retune from RENNtech.

Re:OP...OBC is consistently about 2 mpg low for me.
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      08-31-2013, 11:40 AM   #16
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Quote:
Originally Posted by FormerRotor
Quote:
Originally Posted by Puerto Rican 335d View Post
I strongly suggest you get a bigger IC for that matter and you will regain mpgs on HWY. I know I have made some mods i.e RENNtech/WAGNER IC/Air scoops and Im getting 21-23 city mpgs, its hard to get hwy mpg's since there TOO many vheicles here in the island but I once clocked over 44 mpgs at 70-75 mph at a short distance of 20 miles with A/C on. good luck on this.
FWIW I have seen no mpg changes to the positive since installing the Wagner. If you are, I would suspect it is because of your retune from RENNtech.

Re:OP...OBC is consistently about 2 mpg low for me.
You can adjust/correct it
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      08-31-2013, 04:03 PM   #17
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It all depends on driving style. Power mods can increase mpg by giving you enough power to use less pedal on a trip or less mpg because you can't stop pushing the petal to feel the power.
More importantly an IC will vary quite a bit on location. Here in Las Vegas it is very hot and dry, better IC and utilizing liquids for evap and injection (say spraying your IC or injecting meth) make a huge difference. Power can be had anywhere, but the horrible heat soak from stopping at a light or traffic can really make for bad mpg.
In the summer here in the evenings I used to drive by a golf course on the way home everyday when they were watering the dense cooler air made your car accelerate although you never pressed on the accelerator because the difference in power you were getting from the same amount of fuel being used.
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      08-31-2013, 04:04 PM   #18
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Quote:
Originally Posted by taibanl View Post
You can adjust/correct it
This is also correct. If your OBC is consistently say 2mpg off every time, you simply correct it to up or down the 2mpg and it will start giving you the correct reading.
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      09-01-2013, 03:17 PM   #19
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Quote:
Originally Posted by zoltans4 View Post
This is also correct. If your OBC is consistently say 2mpg off every time, you simply correct it to up or down the 2mpg and it will start giving you the correct reading.
How do you do this?
Never heard of this before.
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      09-01-2013, 07:35 PM   #20
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Quote:
Originally Posted by White D
Quote:
Originally Posted by zoltans4 View Post
This is also correct. If your OBC is consistently say 2mpg off every time, you simply correct it to up or down the 2mpg and it will start giving you the correct reading.
How do you do this?
Never heard of this before.
Hidden bc menu item 20
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      09-02-2013, 12:43 AM   #21
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Quote:
Originally Posted by taibanl View Post
Hidden bc menu item 20
Never knew that existed. Mine has been off by 1mpg or so every fuel up. Thanks.
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      09-02-2013, 05:18 AM   #22
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How does one correct for proper mile measurement? I used to live in areas where you could do this with special mile markers. Now all we have is GPS, so when you correct for mpg on the hidden computer screen, how does it do it? Does it "fix" the mile reading or does it fix the gallon reading or does it just make a calculation adjustment?

The reason I ask is that if the mile reading is off, so is the manual calculation.

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