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Old 11-13-2012, 10:29 PM   #1
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Join Date: Oct 2012
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My Ride: 2005 BMW 325i
Thule 753 roof rack MPG difference

Hey everyone, about a month ago I installed a Thule 753 roof rack with a fairing onto my 2005 325i (sport package) and I did somewhat of a MPG study on it, if anyone cares.

Prior to installing the roof rack, on my 32.4 mile trip to work (there and back) I would average between 26.3-30.0 MPG on the trip computer (depending on traffic).

After installing the roof rack, I would average 25.3 - 29.1 MPG on my trip computer for the same drive.

My drive to work is about 15 minutes of city and 15 minutes of 55-60 mph freeway driving. So basically, the Thule 753 takes off roughly 1.0 mpg.

Based on my average use of the car, this would translate roughly to an extra 19 gallons of gas used over the course of a year with the roof rack on. A small price to pay in my opinion to be able use the car to go surfing!

I also noticed that the trip computer MPG is consistently 0.9 - 1.0 higher than the actual MPG over a full tank of gas.

Just thought I'd pass along information.


Last edited by timtower; 11-13-2012 at 10:32 PM.
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Old 11-14-2012, 07:03 AM   #2
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Join Date: May 2008
Location: NYC
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My Ride: '02 330i 6MT
When I had the BMW roof rack I don't know if it was placebo or not but I felt a difference. I drive on the highway around 60-80 so when it's windy it does make the car float around a lot too.
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Old 11-14-2012, 08:49 AM   #3
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My Ride: 330Ci MT, 545i SMG
The roof rack on my E60 with two bikes makes 2 to 3 mpg difference. So it's only on there when I'm actually carrying bikes.
Engineers do it with a torque wrench
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thule 753 mpg bmw 325i

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