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      04-07-2016, 06:58 AM   #1
Mik325tds
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Best diesel mileage

I don't remember seeing a thread for this. Cruising through NC the other day I noticed that me & car really likes the up and down hilly roads. I'm on a Jarek stage 1 tune with all deletes and an empty SCR. On my daily commute with 80% Hwy I usually average 34-35mpg, but this really surprised me:
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      04-07-2016, 07:01 AM   #2
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I've gotten 42.5mpg (hand calculated) on a 353mi trip from VA to NY. It was a pretty boring ride lol
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      04-07-2016, 07:34 AM   #3
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Wow, what is your average speeds? I get 28mpg on my daily commute. Highest was 39mpg from GA to PA.
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      04-07-2016, 07:50 AM   #4
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After the delete and BPC Stage 2 tune, I have seen 42 mpg on purely highway driving. My daily commute is in the 30 - 31 mpg range over some rural highways. Even around town (Saturday errands, soccer practice runs, etc) I am getting 27 - 28 mpg.
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      04-07-2016, 08:14 AM   #5
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I've gotten hand-calculated 42 mpg from Savannah, GA to Tallahassee, FL. Straight highway seems to always net 40+ mpg.
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      04-07-2016, 08:33 AM   #6
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On a full tank it was 41.66 (hand calc) driving 532 miles between St Louis toward Washington, D.C. That was before my car's illiteracy kicked in, btw. Since then I have seen indicated tank totals of as high as 760 but never stayed on the highway long enough to find out.
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      04-07-2016, 09:55 AM   #7
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39.2mpg over 600 mile trip from NY to VA. Car had pretty bad CBU though. I'm confident she'd average 40mpg if I were to do the trip again.
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      04-07-2016, 10:04 AM   #8
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Recent trip from DFW to Gulf Shores AL, 34.5 MPG for the whole 1500+ miles.
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      04-07-2016, 11:45 AM   #9
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I went to view a car last Sept, not in any hurry I set the cruise at 65mph to see what she would do if really trying. 102 miles in total....

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      04-07-2016, 03:31 PM   #10
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42 MPG over 191 miles driving 70 mph on mostly flat ground (south Louisiana), no a/c and no wind. Pretty much ideal conditions. Stock car other than VAC piggyback.
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      04-07-2016, 04:27 PM   #11
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I average 25Mpg at 29MPH over the past 10k miles,

I will get 29MPG at 100mph and 50Mpg and 60MPH
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      04-07-2016, 05:56 PM   #12
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Quote:
Originally Posted by briansjacobs View Post
I average 25Mpg at 29MPH over the past 10k miles,

I will get 29MPG at 100mph and 50Mpg and 60MPH
I'm getting as high as 48 mph at 75mph. Wind direction is huge for me
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      04-07-2016, 07:27 PM   #13
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When I drove from Detroit to columbus to louisville, i set the cruise at 75mph and got a hand calculated 39.74 mpg. I prefer to get 37-38mpg at 80-85mph though, 75mph feels sooooooo sloooooow in a 335D.
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      04-07-2016, 08:19 PM   #14
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Quote:
Originally Posted by tek4tex View Post
I'm getting as high as 48 mph at 75mph. Wind direction is huge for me
downhill, downwind with a sail up and over inflated tires, hypermiling behind a semi maybe. LOL
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      04-07-2016, 08:29 PM   #15
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I've got two 2011 335d cars, and the best I ever have achieved on an extended highway drive, speeds 70-80 MPH, distance over 150 miles, was 36.1 MPG.

I'm jelly of all you 40+ folks !!
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      04-07-2016, 09:41 PM   #16
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My best tankful was 40.2 mpg hand-calculated. That was before my tune. I haven't been patient enough to drive all day at 70 mph since my tune.

My tune has improved my mileage by about 5-7% it seems. I can now get 43.1 mpg on my 123-mile commute with the cruise control set on 75 mph for the interstate leg (60%). I believe the computer since the entire tank reported mileage agrees with the hand calculation.
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      04-08-2016, 08:32 AM   #17
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Quote:
Originally Posted by QUIKDZL View Post
I believe the computer since the entire tank reported mileage agrees with the hand calculation.
I have also noted that the computer estimate is quite accurate now, post-Jarek Stage I.
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      04-08-2016, 11:09 AM   #18
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Quote:
Originally Posted by Persian Whisperjet View Post
I have also noted that the computer estimate is quite accurate now, post-Jarek Stage I.
Same here. The hand calculated now is about 0.5 mpg higher than my display.
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      04-08-2016, 11:12 AM   #19
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Quote:
Originally Posted by chau View Post
Wow, what is your average speeds? I get 28mpg on my daily commute. Highest was 39mpg from GA to PA.
Average speed is hard to say. I was going up and down hills all the time so uphill I went about 50 while downhill I just let it float with a little gas so I wouldn't get engine brake.
One thing I noticed though was that with cruise control my car will actually use it's brake in order not to over speed on the downhill.
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      04-08-2016, 11:16 AM   #20
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Very strange - on my way back I wasn't able to get the mileage above 38mpg even though I tried drove the same speeds.
I'm beginning to think that there might be big differences in diesel quality. Maybe wind played a role, maybe going back up north?
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      04-08-2016, 12:54 PM   #21
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my best was 38mpg. My lifetime combined is 30mpg. Majority highway I see 32-34 usually.
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      04-08-2016, 03:22 PM   #22
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Quote:
Originally Posted by larrysing View Post
I've got two 2011 335d cars, and the best I ever have achieved on an extended highway drive, speeds 70-80 MPH, distance over 150 miles, was 36.1 MPG.

I'm jelly of all you 40+ folks !!
Best hand-calculated mpg is around 37 for me. Averaged 34.5 round-trip from Lake McConaughy NE (Ogallala) to Monument, CO. 1st run after alphabet delete and before SCR clogging up JR stage 2. Included a run to 157 Mph (actual speed via GPS). Just rolling on the throttle and slowed the hell down.
Usually average 33-36 MPG mixed hwy/mtn/city - We never drive below 84 Mph on the interstate if traffic permits. Again actual speed via GPS not the indicated 90 mph. (All Bimmers read 5-7% more than actual MPH as most of you know). Agree that Lie-O-Meter is pretty accurate and even a little conservative.
I'm jealous that you have 2 335d's! We do have a 335d and an X5 35d though Our X5d is tuned by BPC but have not R&R'd the DDE and exhaust yet.

Last edited by fsd350; 04-08-2016 at 03:39 PM.. Reason: round trip info
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