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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Fuel Econ for N52



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      04-25-2017, 03:28 AM   #23
Centmaker
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Drives: 06' Red 325i
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My 325i mpg stays above 20 mpg city. I drive in manual mode at all times unless I'm eating and I shift at 2k rpm starting in 2nd and I get into sixth as fast as I can. I drive at least 45-60 on almost every road regardless of speed limit. I mix that with ultra aggressive redline shifts. When I cruise control I see an instant boost in mpg so I cruise control often but I don't let the car brake on a downhill. I actually accelerate on downhills and I let it lose a little speed uphill.

Last week I drove from South Bend to Bloomington (3.5 hours) and averaged 32.1 with two near top speed runs on the way. The rest of the time I cruise controlled at 65. I Ubered for a few hours (lots of idling) and drove all day pedal to the metal at every green light until my mpgs dropped to 20 then drove back the next day. By the time I got back my mpgs were back to 28.

South Bend is less stop and go, with longer distances between stop lights and plenty of roundabouts and I also try to time green lights. I also don't slow down at all in corners or roundabouts. Here in this city is where I average about 22 or more but I have occasional bouts of aggressive driving. If I'm too aggressive it'll drop to 20.

When I first got my car I was getting 17ish mpg a year and a half ago. I have since switched to non-run flats and light-weight ec7 18's, ran fuel injector cleaner through it, and drive in manual mode at all times. I only use 93 octane and if a gas station only has 91 I go to another one. I don't have much horsepower to give up. Oil level hasn't changed at all in the last 5000 miles so I guess it doesn't really burn much oil.

Last edited by Centmaker; 04-25-2017 at 03:49 AM..
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      04-25-2017, 09:25 AM   #24
blu3wolf
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Quote:
Originally Posted by doru View Post
My 2007 X3si with the three stage manifold gets 20mpg in the city. Did quite a few maintenance repairs a few weeks ago: new valve cover (the old one was warped), new plugs, new air filter, oil, OFHG, exp tank & plate.

Maybe the air filter is not up to snuff? I see you changed the plugs. My daughter (she's driving it) uses Shell Vpower (91 as well).
That's good mileage. we only use Vpower on the N/A cars (sometimes I've used Canadian tire 91 on this once or twice). OFHG was changed so was the filter. Haven't done anything else still under CPO for the car so wont do the rest of the stuff unless it goes.
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      04-25-2017, 10:07 AM   #25
anjuna
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26.3 all day every day.
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      04-25-2017, 07:20 PM   #26
Zajac1
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highway and city mix average 20 mpg on e91 6mt
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      04-25-2017, 07:41 PM   #27
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328i X0drive wagon, Highway & City, driving calmly I average about 22-23MPG.
Most I've had from a tank was over 400 miles on more than one occasion... That indicated about 26-point-something mpg, and calculated (miles driven divided by gallons fill-to-fill) came out to be 25.95, if I recall.

The indicated-to-actual error was about 7 or 8 percent, I think, which is not as good as my Audi used to do (typically within 2%) but it's not all that much of an annoyance.
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      04-25-2017, 08:26 PM   #28
AWSB328iM
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Bone stock 328i M-Sport 6MT. 23 around town and 30-31 on highway.
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