Last post on Mar 23, 2012 at 8:31 PM
You are in the BMW 3-Series
What is this discussion about?
BMW 3 Series, Fuel Efficiency (MPG), Sedan
#48 of 93 Re: The gas gauge drops to 0 suddenly, but I really have gas! [absolutic]
Dec 04, 2007 (12:27 pm)
What could be the problem?
The E36(1992-1999) 3 Series cars had a similar issue. In that case the problem was caused by corrosion deposits on the fuel sending unit contacts within the gas tank. BMW cured the problem by introducing a replacement unit fitted with gold contacts that do not corrode. I solved the problem on my 1995 and 1998 3ers by using only Top Tier gasolines- which contain detergent properties that prevent the deposits from occuring. That said, since your car is still under warranty I'd simply return it to the dealer. If you want to attempt an interim fix, you could try adding a bottle of Techron to your fuel; it can't hurt and it may fix the problem temporarily.
#49 of 93 My 2007 Data
Dec 27, 2007 (9:10 am)
2006 330i, non-sport.
Put on nearly 11,000 miles in 2007 and averaged 24.34mpg in a mixture of roughly 2/3 highway 1/3 city driving. Best tank (mostly highway) returned 27.31mpg. Worst tank (mostly city) returned 21.17mpg. Use sports mode frequently in city driving.
No question in my mind this car would get low 30s on a highway trip, and not just in the right lane at 55mph. I've seen what it's capable of on highway drives of 30 to 60 miles, at 70-80mph. I always have my on-board computer set to display the mpg.
Quite pleased getting this kind of gas mileage from a sports sedan. The G35 I had before it averaged about 22mpg.
#50 of 93 Re: My 2007 Data [davidd3]
Dec 27, 2007 (9:11 am)
Oh yeah, I should have mentioned that my car has an automatic transmission.
#51 of 93 Re: The gas gauge drops to 0 suddenly, but I really have gas! [roadburner]
Dec 27, 2007 (9:48 am)
Thank you roadburner, I have been using only the premium gas and I told the dealer about the problem, and it appears from the comments they did some diagnostics on it.
#52 of 93 Re: My 2007 Data [davidd3]
Dec 27, 2007 (9:59 am)
That is a great mileage. Mine on my 328i is steady 19.1-19.3 mph 80% City/20% stop-and-go freeway. I do use sports mode sometimes. I have 11,000 miles on it. I assume it will improve a little as I drive another 5-10,000 miles and I will be very happy.
I assume with new EPA testing rules come around 2009, we are going to see more realistic figures. Hopefully, they will take cars off treadmills to an outside environment this time
#53 of 93 Could be better
Dec 27, 2007 (12:00 pm)
I drive a 2007 328xi. 60% hiway 40% hilly country roads in CT with a few stop lights. I average consistently 22MPG on 93 octane. This has been true from my third tank of gas. In cold weather I may get 1 or 2MPG worse. I am not lead footed. On the hiway over 100+ miles without stops I can get as much as 27MPG at 70-75MPH (by BMW speedo which we all know reads 4-5MPH fast at this speed). This seems to be consistent with others.
#54 of 93 Re: My 2007 Data [absolutic]
Dec 27, 2007 (12:07 pm)
"I assume with new EPA testing rules come around 2009, we are going to see more realistic figures."
Correct me if I'm wrong, however, I believe that the new EPA mileage ratings went into effect for the 2008 model year.
#55 of 93 Re: My 2007 Data [absolutic]
Dec 27, 2007 (1:35 pm)
Mine on my 328i is steady 19.1-19.3 mph 80% City/20% stop-and-go freeway.
Your city/highway mix is heavy on city driving (80%) and even your highway miles (20%) are stop and go. I think 19+mpg is good for your particular circumstances.
I have 11,000 miles on it. I assume it will improve a little as I drive another 5-10,000 miles and I will be very happy.
My 2006 330i has 35,000 miles on it. While many people say gas mileage improves after the first x,000 miles, I have never personally experienced it. With my cars, the mpg from the beginning is pretty much the same throughout.
#56 of 93 Re: My 2007 Data [davidd3]
by Mr_Shiftright HOST
Dec 27, 2007 (5:24 pm)
I agree. By 3,000--5,000 miles you are locked in.
#57 of 93 2007 328i: MPG Improving
Feb 23, 2008 (9:21 am)
I live in the SF Bay Area and have been averaging 19-20 with stop/go traffic (70%) and highway (30%). I have just over 6700 miles now and for the last 500 or so miles my mileage has jumped up pretty significantly, averaging 23.0 without a change in driving pattern. Nice! I've only been filling it with Shell 91, seems to be a pretty good formulation.
I was able to fill up one day, get right on the highway, and drive about 45 minutes WITHOUT traffic (I was shocked) doing 75-85mph and averaged 32.3 mpg roundtrip. The engine is clearly fuel efficient if given the right opportunity. Looking forward to a weekend trip to LA in a few weeks to get an even better assessment.
Just wanted to post my results thus far, will keep you posted after the LA trip (approx 5 hours). Still can't believe I haven't changed the oil yet, I'm starting to lose sleep about waiting another 9k miles to change it!