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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 > Best HWY MPG



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      07-26-2014, 02:04 PM   #1
eurojulien
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Best HWY MPG

For about 200 miles I was averaging 42 mpg, a/c on, rolling hills on a stretch of I81. Average speed was 75 mph.

I was doing slight hypermiling:
- Coasting down hills
- Didn't accelerate going up hills
- Never used the brakes

Once I stopped caring and after a little city driving I totaled out around 39.2 MPG for the 700 mile trip.

I figure with lighter wheels/tires/brake rotors? a tune and a mufflerectomy I could get into the mid 40s.

What have you guys seen?

If this is a duplicate thread, sorry
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      07-26-2014, 02:25 PM   #2
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39+ mpg highway cruisng 70-75mph. No AC, with JBd.

I noticed cruise control manages mpg at optimum. I try to use it on the highway.
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      07-26-2014, 03:01 PM   #3
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There's no way you can get even decent hwy mpg around my parts unless you're on the road anytime past midnight to comfortably activate cruise control.

I need to go on a road trip soon to see how well my diesel can do in the mpg department.
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      07-26-2014, 03:17 PM   #4
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40.8 for the entire tank, doing some city driving too.
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      07-26-2014, 03:45 PM   #5
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23 avg..
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      07-26-2014, 04:08 PM   #6
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Best I've seen 39.2mpg, full stock set-up, RFTs, no hypermiling, A/C on, and about 10 city/idling thrown into it, some steep hills.
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      07-26-2014, 05:02 PM   #7
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23 avg..
im in this boat.
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      07-26-2014, 05:26 PM   #8
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Quote:
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Quote:
Originally Posted by 335dlci View Post
23 avg..
im in this boat.
By choice?? Lol
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      07-26-2014, 09:05 PM   #9
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39 mpg highway 70-75mph
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      07-27-2014, 12:06 AM   #10
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almost 44mpg cruising behind an 18-wheeler for an hour at 75 mph. For non-hypermiling: 40mpg from Tampa to New Orleans with cruise at 70mph and a/c on.
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      07-27-2014, 04:46 AM   #11
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went for a drive today, 36mpg with cruise control at 71.
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      07-27-2014, 09:17 AM   #12
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I'm ~36 mpg, but the needle is between 80-85. Unlike inter-urban hwys I try to go as fast I can safely and without getting pulled over.
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      07-27-2014, 10:14 AM   #13
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Somewhere around 43 is about the limit I've ever gotten. That was in ideal (no wind, 60-65 mph) conditions.

Mileage is in the $hitter if under 50 mph (can't get into 6th), and anything over 65 mph starts to lower mpg also. Big fat sports package tires don't help, nor do runs to 100+ to pass traffic!
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      07-27-2014, 10:19 AM   #14
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My road trip last August of 6,500 miles from east to west and back had several tanks in the high 39 to low 41 range. Am heading next week on another road trip, but this time from Portland OR to Pagosa Springs CO and back, with a meandering itinerary on the way back to see the natural sites in the Rockies, northern AZ, southern UT, etc. Will post trip report with mileage and some pics. I am at 34.5k miles on the odometer.
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      07-27-2014, 10:58 AM   #15
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Quote:
Originally Posted by floydarogers View Post
Somewhere around 43 is about the limit I've ever gotten. That was in ideal (no wind, 60-65 mph) conditions.

Mileage is in the $hitter if under 50 mph (can't get into 6th), and anything over 65 mph starts to lower mpg also. Big fat sports package tires don't help, nor do runs to 100+ to pass traffic!
Never ever ever ever have done that
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      07-28-2014, 11:46 PM   #16
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I've seen 47 mpg during prolonged highway driving.
31 mpg in mixed city/hwy

K
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      07-29-2014, 08:51 AM   #17
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Im fucked down here on the ISLAND, the best recorded for a small stint on the OBC was 42 mpg at 70 mph with RENNtech flash WAGNER IC staggered wheels at 18" besides that Im lucky to get 21-24 mpg combined, plus the fact that Im a racer doesnt help at all
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      07-29-2014, 10:27 AM   #18
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37.3mpg @ 85mph was the best I have seen. My vehicle average is 27.7 on a 65/35 city/highway daily commute.
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      07-29-2014, 11:09 AM   #19
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Since you asked... 99 MPG going down a six percent grade with my right foot resting comfortably on the floor board!
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      07-29-2014, 11:25 AM   #20
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I just completed a 1100 mile drive back to TX and averaged 30mpg over the entire trip (via idrive). I noticed that the efficiency shows ~48 mpg @ 84mph. That's consistent with my other 335d which displays the same consumption rate at that speed. Sure seems high but the slightest rise or change in pedal input causes the efficiency to plummet.
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      07-29-2014, 10:09 PM   #21
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Quote:
Originally Posted by AngelorDevil View Post
I just completed a 1100 mile drive back to TX and averaged 30mpg over the entire trip (via idrive). I noticed that the efficiency shows ~48 mpg @ 84mph. That's consistent with my other 335d which displays the same consumption rate at that speed. Sure seems high but the slightest rise or change in pedal input causes the efficiency to plummet.
I can see that, these cars are super efficient off boost. I did have an issue breaking that 42 MPG threshold. I think that the higher up in MPG you get the less increments the computer will display. ie 1/3 mpg around 20mpg , 1/2 mpg around 30, 1 mpg around 40, 3-5? mpg jumps? .
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      07-30-2014, 10:46 AM   #22
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I'm generally at 36MPG in 80-85mph traffic with no attempt to conserve fuel.

I have hit 42 for a 155 mile trip at 65 MPH, but it features a 1000 foot elevation change from start to finish. Return trip was 40MPG. I can't drive like this.
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