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Affect of Roofbox on fuel consumption

 
Old 01-18-2018, 12:00 PM
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GLK250 2014
Affect of Roofbox on fuel consumption

We make the same trip every year from Canada to USA. Up until this year, we did it with roofrack and Thule box. Two in car, rear seats down and cargo of normal stuff - suitcases, golf clubs, etc.

In past years, mileage on trip down was about 31.5. Then once unloaded and perhaps using non-winter fuel, about 32mpg down here with 90% highway. This year without roofbox, mpg improved to 33.5 on way down and about 34.5 down here in SC. Nothing like some claim, but better that in past. Our mpg since last reset over a year ago, is 33.1. In summer in Canada we do a lot better. (36+mpg on highway)
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Old 01-18-2018, 12:32 PM
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2015 GLK350
What year and model? Are these imperial gallons?
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Old 01-19-2018, 09:32 AM
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Originally Posted by formerjeepguy View Post
What year and model? Are these imperial gallons?
Sorry - I should have included those.

2014 GLK250.

In Canada we use L/100km, but I am in USA so using USGallons.

No imperial gallons these days in Canada
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Old 01-20-2018, 03:19 PM
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'85 190D , '12 E350 BlueTec, '13 GLK 250 BlueTec
Haven't put anything on top on mine but I skied a lot driving a domestic SUV throughout the West. Some trips with ski racks on top and others without. I attributed a difference of 3mpg to anything on top, even the empty racks. Didn't take long to pack with skis inside. Depending on traffic I've gotten right a 40mpg on my GLK. Shorter trips with traffic or hills and curves I've gotten as low as 32mpg.
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