Last post on Sep 16, 2011 at 12:33 PM
You are in the BMW 3-Series
What is this discussion about?
BMW 3 Series, Sedan, Wagon
#68 of 429 Re: Disappointing mileage in 335xi [circlew]
Oct 05, 2007 (6:05 am)
It so happens that I was golfing yesterday with a friend that owns a 2002 330cic convertible. They moved last year and he now has a 32 mile one way commute, about 25 miles of which is 60+ mph highway and the rest stop and go suburban (not city) roads. He keeps meticulous mileage records and over the past year (18,000 miles) has averaged right at 25.0 mpg. On pure highway trips of 200+ miles, he has gotten as high as 33 mpg, but averages about 29-30. These figures are all about 1 mpg better than my 1995 Nissan Maxima, which is pretty impressive, since I think the BMW weighs about 300- 400+/- lbs more than my Maxima.
P.S. He has a hardtop that he uses between November and March, but uses a beater SUV in very cold or snowy weather. Also, his car is a 5-speed manual (as is my Maxima).
#69 of 429 Re: Disappointing mileage in 335xi [habitat1]
Oct 05, 2007 (6:59 am)
My problem is my speed on the hwy side of things is well north of your freinds and the xi heft/drag thing.
Your friend gets a 13.6% efficiency advantage due to the drive train differences and his driving style. Very impressive for a BMW of recent vintage. I am sure the older models of the 3-series were/are higher m.p.g. due to the weight advantage but given 3,500 - 3,700 lbs., technology moves ahead.
I can just imagine what these drive trains are capable of with 500 lbs. shaved off the package! HMM...I smell 1 series, stripped, however!
#70 of 429 Re: Disappointing mileage in 335xi [circlew]
Oct 06, 2007 (3:31 am)
My problem is my speed on the hwy side of things is well north of your freinds
I should have stated that the speed limit on those roads is 60-65. He's a bit more aggressive.
Which brings up another issue. We've all had it drummed into us that we'd get better fuel efficiency at 55 vs. 65 vs. 75. In my TL 6-speed, I get almost exactly the same, having driven the same highway route in the same weather conditions many, many times. Anything less than 60 mph in 6th gear feels like the car is lugging and I need to downshift to pass. Once I go above 75-80, efficiency drops slightly, but it appears that the sweet spot on that car is around 72-75. In the case of my 911S, my best ever highway tankful was a 360 mile trip at an average speed of 76 mph (80+ much of the way) in which I averaged 27.8 mpg (vs. EPA of 25). At 65-70 I average 26-27.
I think many/most 6-speed manual transmissions are geared for peak efficiency in the 70-75 mph range, not 55.
#71 of 429 Re: Disappointing mileage in 335xi [habitat1]
Oct 06, 2007 (5:03 am)
For a hwy-only trip only, 330xi mpg is 26-27. With no traffic, I have reached a best of 28.
Not bad for an AWD sled!
#72 of 429 Re: Disappointing mileage in 335xi [habitat1]
Oct 06, 2007 (5:06 am)
"I think many/most 6-speed manual transmissions are geared for peak efficiency in the 70-75 mph range, not 55."
Both of my 5-Speed manual equipped BMWs had their sweet spot for mileage somewhere north of 70 as well. My 2002 530i would do about 31 mpg at 75 while my 1999 328i would get more like 34-35 mpg at those same speeds.
#73 of 429 Re: Disappointing mileage in 335xi [shipo]
Oct 06, 2007 (6:08 am)
What was your combined MPG and what do you think you average over the life of ownership of the 3 vs. the 5? I think the weight differences from today's cars are 300-500 lbs, 3-series, 5-series, respectively. Correct me if I am wrong, please.
#74 of 429 Re: Disappointing mileage in 335xi [circlew]
Oct 06, 2007 (7:03 am)
Here's something scary I never bothered to look up. The 335i weighs 3594 lbs and the 535i weighs 3660 lbs.
I had no idea - the 5 series is only 66 lbs heavier!
#75 of 429 Re: Disappointing mileage in 335xi [circlew]
Oct 06, 2007 (7:08 am)
IIRC, the combined mileage on the 328i (less than 3,300 pounds) in NYC metro traffic was about 22 and my life mileage was between 25 and 26. For the 530i (less than 3,600 pounds) I also got about 22 in NYC and Boston area driving and 26 to 27 for the life of the car (it ran on the highway a far greater percentage of the time than did the 328i). As a side note, per the OBC, the 530i was still delivering over 20 mpg at 125 mph while I was in Germany.
#76 of 429 Re: Disappointing mileage in 335xi [fedlawman]
Oct 06, 2007 (5:23 pm)
OK, here's the question of the day...how/why can they keep the weight down on the 5 and let the weight gain on the 3?
Shipo, that's really good mileage. I assume you also did spirited driving over the life of both cars. Very impressive numbers, IMO.
#77 of 429 Re: Disappointing mileage in 335xi [circlew]
Oct 06, 2007 (5:51 pm)
The 5er is kept relatively light because it was endowed with a lighter (and more expensive) aluminum front end and extensive use of aluminum elsewhere.
As for the mileage I got on my BMWs, yeah, I they did pretty well for me. There was plenty of spirited driving done over the life of both cars. That said, their almost astounding highway mileage always seemed to bring the average up pretty darn fast.