[3rd party]

Originally Posted by hyperboost

I don't think so. If i put back the OEM 19"s with run flats, i will get maybe 17mpg overall.




great to know. I am also wondering how well the car drives when it's cold. Usually takes longer for them to warm up and you have to take it easy when it's cold.

Are your current tires the same diameter as original equipment?

[hyperboost]

Originally Posted by 3rd party

Are your current tires the same diameter as original equipment?

Yes exactly the same. My lightweight wheel tire are all 19"

[3rd party]

I think 20mpg in winter w ethanol in a 4000lb+ car is pretty darn good.

[hyperboost]

Originally Posted by HighlandPete

Nothing wrong with running lighter wheels from my viewpoint, there are clearly benefits, including a slight fuel advantage, but for a moment but look at it this way.

Motor manufacturers in Europe are desperate for fuel savings, (regulation and impending penalties). If wheel weight could really give a 20% improvement in mpg, they'd be on it in a heartbeat. What a simple way to meet targets.

HighlandPete

I agree Pete, but there is another side to the story. Light weight wheels for a car like the F10 5er, they have to be very strong. Stronger wheels are usually forged wheels and they are A LOT more expensive than the cast wheels. Some cast wheel are just as strong but not as light weight. Also wheels have to be TUV certified for car manufactures to use them. So who will bear down the cost for more expensive wheels? Neither parties want to do that.
I think it's common knowledge that oem BMW cast wheels are sh1t. They are weak and they bend easily.

[washaider_74@hotmail.com]

Originally Posted by jellyfish

2011 xdrive 535. Highway is 28 and local is about 20 mpg. I think it has decent gas mileage for such a large, heavy car. The 8 speed really helps. I take it to speed on the highway and make sure I barely push the throttle. Cruising really. Takes some concentration at first to be light on the throttle while on the highway but has become kind of unconscious now and easy. And let's just say my speed is spirited. But yeah, tough on gas mileage when driving local.

2014 535i xdrive weekdays 85% highway and 15% local, only highway I am getting 700+ KM per tank eco drive - comfort and local not even 500 KM per tank with 60-40 comfort-sports.
I am happy with mileage so far. If I want to enjoy then I have to pay for it.