Mileage Question

Karff · 08-30-2019, 05:28 PM

I have a 13 x35d. Has anyone ever heard of a dramatic difference in mileages on the highway with or without the sunroof open ?

quick · 08-30-2019, 07:59 PM

If you want to enjoy an open sunroof then why not besides how much could you save anyway?

Qsilver7 · 08-31-2019, 11:38 AM

Depending on how far it is open...it affects it some...but it's probably negligible since the sunroof has a little spoiler that pops up which facilitates diminishing wind buffering as well as helping to direct air over the top of the car and prevents it from creating a low pressure area inside the cabin (unlike what happens in the bed of a pick-up truck).

what have i got into · 08-31-2019, 02:34 PM

My commute is Portland to Seattle, so about 3 hours with about 2 hours at 70+mph. Absolutely no difference in mileage with sunroof open and sunroof closed. Now noise can get to be annoying after a couple of hours of having the sunroof open and all the traffic.

08-30-2019, 05:28 PM	#1
Karff New Member 0 Rep 8 Posts Drives: BMW X5 35d Join Date: Jul 2019 Location: USA iTrader: (0)	Mileage Question I have a 13 x35d. Has anyone ever heard of a dramatic difference in mileages on the highway with or without the sunroof open ?
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08-30-2019, 07:59 PM	#2
quick Captain 216 Rep 780 Posts Drives: '12 X5M, '01 E55, '91 964 Trbo Join Date: Oct 2010 Location: Planet Earth iTrader: (1)	If you want to enjoy an open sunroof then why not besides how much could you save anyway?
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08-31-2019, 11:38 AM	#3
Qsilver7 Major General 4442 Rep 7,484 Posts Drives: F06 650ix GC / F15 X5 50i Join Date: Oct 2016 Location: Indiana, USA iTrader: (0)	Depending on how far it is open...it affects it some...but it's probably negligible since the sunroof has a little spoiler that pops up which facilitates diminishing wind buffering as well as helping to direct air over the top of the car and prevents it from creating a low pressure area inside the cabin (unlike what happens in the bed of a pick-up truck). __________________ 2015 F06 650ix Gran Coupe`(Moonstone/Cohiba Brown)\| 2014 F15 X5 50i MSport (Space Gray/Mocha) Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.
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08-31-2019, 02:34 PM	#4
what have i got into Private 14 Rep 54 Posts Drives: 2012 135i, 2013 X5d Join Date: Mar 2015 Location: Portland OR iTrader: (1)	My commute is Portland to Seattle, so about 3 hours with about 2 hours at 70+mph. Absolutely no difference in mileage with sunroof open and sunroof closed. Now noise can get to be annoying after a couple of hours of having the sunroof open and all the traffic.
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