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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 10-09-2012, 08:02 AM
beenthere1130 beenthere1130 is offline
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When did the mpg being to settle?

Hi All,

My 2013 328i coupe (x-drive) is about 300 miles old. I'm about half-way through my second tank of gas and with a 50/50 mix of city and highway, I'm averaging about 15.5 MPG. I know that there is a break-in period before the true MPG begins to show.

Any idea how long it took before your car began to return the "true" mpg not the "break-in period" mpg?

Thanks!
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  #2  
Old 10-09-2012, 08:20 AM
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Quote:
Originally Posted by beenthere1130 View Post
Hi All,

My 2013 328i coupe (x-drive) is about 300 miles old. I'm about half-way through my second tank of gas and with a 50/50 mix of city and highway, I'm averaging about 15.5 MPG. I know that there is a break-in period before the true MPG begins to show.

Any idea how long it took before your car began to return the "true" mpg not the "break-in period" mpg?

Thanks!
You will be lucky if you can average 18mpg! Maybe a thousand miles you should be getting the best your going to get. It really doesn't take that many miles, the engines do not change much!
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  #3  
Old 10-09-2012, 08:29 AM
beenthere1130 beenthere1130 is offline
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Well, it beats the 12 mpg I was getting in my ML350-- though, I was hoping to be in the 20 mpg area. Oh well.
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  #4  
Old 10-09-2012, 08:39 AM
Rainman519 Rainman519 is offline
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My 2010 328 has 15K on it and I'm averaging between 25-28 mpg (depends on driving habits and type of gas I use). When new, it took approx 3K miles before I started to see realistic gas mileage in the 25+ mpg range. A recent trip revealed 30 mpg on the highway. I've noticed that it gets better mpg on gas of 91 or higher octane also. Keep watching it, it'll improve as you rack up the miles.
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  #5  
Old 10-09-2012, 08:49 AM
beenthere1130 beenthere1130 is offline
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Thanks Rainman-- that is exactly what I was looking for.

I have done the 89 v. 91 choice at the pump only once and I decided that if there is *any* benefit to be had, I'm willing to pay the $1.20 or so to have it. Moreover, if the results are inconclusive (and, thousands of pages on this forum with differing opinions would support that), I'm willing to spend less than the cost of my daily coffee for piece of mind.
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  #6  
Old 10-09-2012, 03:25 PM
ProRail ProRail is offline
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Originally Posted by beenthere1130 View Post
Well, it beats the 12 mpg I was getting in my ML350-- though, I was hoping to be in the 20 mpg area. Oh well.
In a 328 you should easily be able to get in the 20's in local driving, more on the highway. Check your driving habits. Are you doing a lot of braking and accelerating? That really sucks up the gas. I have a (1999) 528 and typically get in the low 20's in local driving and the mid 30's on the interstates.
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  #7  
Old 10-09-2012, 04:26 PM
beenthere1130 beenthere1130 is offline
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20s in local driving? I don't see it. I do have an x-drive which doesn't help (though I only weigh 110 pounds and my lady is the same so perhaps it's a wash).

I am quite careful in the city to avoid braking (and sudden acceleration that would require braking) but on an open road I can't resist the higher revs on occasion. And, when I say city, I mean Philadelphia rush hour-- never getting above 25mph and a long strong of lights.

I'm still hoping the numbers will improve as the engine loosens up.
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  #8  
Old 10-09-2012, 04:37 PM
leewtech leewtech is offline
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At best 1mpg improvement but nothing as spectacular as you might hope. There is no magic friction loss to increase fuel efficiency as the miles tick off.

I think your driving habits in a new car probably settle down with time as you get use to it. That could account for overall improvement in range. New cars with new owners tend to be less than smooth with their new rides....if that makes sense?

Last edited by leewtech; 10-09-2012 at 04:38 PM.
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  #9  
Old 10-09-2012, 04:55 PM
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I donít understand the different RON requirements for different markets. Are the engines for the NA market detuned to run on 89/91 octane?
The minimum octane I can use in my e92 335i 95, in fact it is for all BMW petrol engines sold in Australia.
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  #10  
Old 10-09-2012, 05:11 PM
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Orient330iNYC Orient330iNYC is online now
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Originally Posted by xxE92 View Post
I donít understand the different RON requirements for different markets. Are the engines for the NA market detuned to run on 89/91 octane?
The minimum octane I can use in my e92 335i 95, in fact it is for all BMW petrol engines sold in Australia.
the US octane rating is AKI.

87 AKI is about 92 RON
89 AKI is about 94 RON
93 AKI it about 98 RON
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  #11  
Old 10-09-2012, 05:14 PM
leewtech leewtech is offline
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I see mostly the R+M/2 octane ratings in the US markets. You are probably seeing the higher RON value but it averages out to be similar in overall rating based on grade used.

Octane does NOTHING to improve mileage. It is only a value for determining how quickly the fuel burns under certain conditions. Higher compression engines need higher octane values to control the burn. Higher octane is not more powerful in that sense it just burns slower.

BMW probably lowered octane requirements as of late due to the ability to control knock/detonation with direct injection, sensors and fuel mapping control on the go.

Use what your owners manual says....anything else is a waste of money.
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  #12  
Old 10-09-2012, 05:38 PM
beenthere1130 beenthere1130 is offline
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It still doesn't make sense to me. In a week, I might drive 40-50 awful city miles in stop and go crawl. But the rest is spent on the highway. As I said, I'm quite cognizant of my acceleration. I do hope that I'll creep closer to 20-25 as the miles tick up.
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  #13  
Old 10-09-2012, 05:53 PM
leewtech leewtech is offline
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Have you reset your driving statistics since you bought it? Might want to refresh your trip meters and get a fresh reading start. I will agree your 15 mpg sounds low for combined.
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  #14  
Old 10-09-2012, 06:11 PM
beenthere1130 beenthere1130 is offline
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.

Last edited by beenthere1130; 10-09-2012 at 06:20 PM.
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  #15  
Old 10-09-2012, 06:20 PM
beenthere1130 beenthere1130 is offline
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I reset the trip computer after the first tank. For this second tank, I've used the first half and I'm averaging 15.5. We use the heated seats often, the AC set to 72, the fan on a low setting and the air recirculator on "auto". Of the 115 miles or so, 20 or so have been City and the rest a mix of open highway and some slower traffic laden highway.

Thoughts? I know some of the driving habits like AC lower mpg, but it's still quite drastic. I'm still hoping this is something that will improve at 1000 miles or so.
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  #16  
Old 10-09-2012, 07:09 PM
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My car had a major reprogramming a couple of years ago, and it basically reset all of the learned modes. For the first two tanks or so, my averag of around 25 went down to 15. Then it went to 20, and made it back to 25 a tank or two later.

I basically just do suburban driving, but any stop and go driving really sucks up the gas as the car climbs through the gears.
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  #17  
Old 10-09-2012, 08:56 PM
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My '08 328xi Coupe got 19.8 MPG with mixed driving. That's the best I could do. Moms 2011 X5 is currently averaging 18.6 MPG(Mixed)
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Last edited by -=Hot|Ice=-; 10-09-2012 at 08:57 PM.
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  #18  
Old 10-10-2012, 05:28 AM
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There shouldnt be that much of a difference, in fact, I was getting the same MPG during the break-in and Im still getting the same 6k miles later. I avg around 24 with 90% hwy and 10% city. Once, I filled a new tank and drove around the city and I got about 18 MPG.
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  #19  
Old 10-10-2012, 08:00 AM
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On my 328, I average around 17-19mpg with an average speed of about 25mph. That is what I have been getting for the past year and a half. I use the car everyday back and forth to work (~25 miles round trip) and rarely use it on the weekends.

In my 528 on the other hand, my wife averages 24-26mpg, don't know the speed avg offhand. But purely on the highway traveling 75-80 mph that car gets 40 mpg no lie!!!! Now that's Efficient Dynamics!
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