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2008 535i 18.3 mpg???

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Old 03-23-2010, 10:50 AM
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the V8 engines should have less mpg's

the OP has a FI/TT I6 engine, so mp's should be higher than those with 545i/550i's...
Old 03-23-2010, 11:21 AM
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I used to be at like 20mpg on the 124's in 18" that was in town highway was much higher,even better than the 530 I'm in now.

If you are in DS a lot,it locks out 6th entirely and opens up 1st....normally the car starts out in 2 and goes to 6th as fast as it can.
Old 03-23-2010, 11:22 AM
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I get 20 mpg city driving with 19" wheels.
Old 03-23-2010, 01:33 PM
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Folks, keep in mind that the wheel size has nothing to do with MPG as the wheel+tire diameter is still the same regardless.
What matters is how wide and what type of tire as that is the rolling resistance which impacts economy.

15657 miles
759.256 gallons of fuel
20.91 MPG (calculated)
21.79 MPG (iDrive)
Average speed of 37 mph.
Old 03-23-2010, 04:26 PM
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Originally Posted by or_550i
Folks, keep in mind that the wheel size has nothing to do with MPG as the wheel+tire diameter is still the same regardless.
What matters is how wide and what type of tire as that is the rolling resistance which impacts economy.

15657 miles
759.256 gallons of fuel
20.91 MPG (calculated)
21.79 MPG (iDrive)
Average speed of 37 mph.
I think wheel size does have something to do with MPG. Relatively speaking, an 18/8.5 and 19/9.5 inch wheel of the same design will not weigh the same. Logically the 19" wheel will be heavier. Granted the tires chosen will compensate for the overall wheel/tire diameter to match oem as close as possible. But with that said, the wheel is STILL heavier. And weight plays a BIG factor in fuel economy. Ask why BMW uses a lot of plastic parts in the engine bay...
Old 03-23-2010, 11:07 PM
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Originally Posted by e6t.lab.rat
I think wheel size does have something to do with MPG. Relatively speaking, an 18/8.5 and 19/9.5 inch wheel of the same design will not weigh the same. Logically the 19" wheel will be heavier.
Sigh. I'll just leave these here for you to review:
BMW e46 style 68 17x7.5 - 21 lbs
BMW e46 style 71 18x8 - 21 lbs
Granted they are not your example 18" and 19" but it should give you the idea that your weight can remain the same even by one inch larger diameter.
Coefficient of friction <- most important. It's the reason all the high MPG cars and bicycles have skinny little tires; cuts down the drag.

Originally Posted by e6t.lab.rat
Ask why BMW uses a lot of plastic parts in the engine bay...
Uh, because it's cheap. And in the case of the engine cover it is to reduce noise. Has nothing to do with weight.
Old 03-24-2010, 12:11 AM
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Originally Posted by ron_cb550
im with brabus and 08

i hover between 13-17 mpg

i dont touch the highway on my work commute.. it's all start and stop.. thats the killer
+1!!!

Originally Posted by GENEaTALS
the V8 engines should have less mpg's

the OP has a FI/TT I6 engine, so mp's should be higher than those with 545i/550i's...
08white has a TT I6 as well. My TT V6 Audi gets about 15.2

Originally Posted by or_550i
Folks, keep in mind that the wheel size has nothing to do with MPG as the wheel+tire diameter is still the same regardless.
What matters is how wide and what type of tire as that is the rolling resistance which impacts economy.

15657 miles
759.256 gallons of fuel
20.91 MPG (calculated)
21.79 MPG (iDrive)
Average speed of 37 mph.
Wheel size generally doesnt matter but usually, 20s are quite heavy.
Old 03-24-2010, 12:12 AM
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and dont forget about the tires and proper tire pressure.
Old 03-24-2010, 05:23 AM
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Originally Posted by brabusw209amg
and dont forget about the tires and proper tire pressure.
+1
depends on tire pressure, wheels weight, traffic lights(if you only travel 2 blocks for 30 minutes, like holiday)

cause low mpg:
low tire pressure
heavy wheels
high speend (130mph)
low speed (10mph in city due to traffic)
Old 03-24-2010, 06:34 AM
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My Ride: 2008 535i Options: Sports Pkg/ Premium Pkg/ Navigation/ USB(iPod) Mods: Tint (lolololol) any ideas? I LOVE THIS CAR!!! (WAAAAAYYYYY better than my previous MB E350, but quite a bit more expensive :( )
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Wassup bro. Yeah 18.3 sounds legit, but there is a solution to get a more accurate reading, which you might already know, but I'll state it anyway. On a side note, when I gun the car around I can get in the ball park of 13-15 which is HORRIBLE for a 6 cylinder engine. The great thing about the N54 and turbos is either get GREAT mileage or HORRID mileage. What you can do is hold that button on the stick (where you can scroll thru MPG, and Miles remaining on the tank, and No reading) for a couple seconds when the MPG is showing. It will reset and you can tell from there, otherwise that 18.3 will always stay there. That's what I IMO have experienced...try it out


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