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Gas mileage with roof rack(5 posts)

Gas mileage with roof rackCartman
Jul 21, 2002 4:59 AM
Does anyone else notice a big decrease in gas mileage with their bikes on a roof rack? I just got a yakama rack, and with 2 bikes, the mileage in our Suzuki Grand Vitar went from 23 mpg to 18. Any ways to help the gas guzzling?
-1 mpg alone, -2-3 with bikes on nmDougSloan
Jul 21, 2002 8:10 AM
re: Gas mileage with roof rackRik
Jul 21, 2002 3:40 PM
I noticed the same and so purchased a trailer that will hold five bikes. On a trip last year we had two families driving identical Caravans, one w/ a roof rack and mine w/ the trailer. My mpg over the 1,500 miles was about 5 mpg better.
with three bikes on a Civic, I drop from ~34 to 26-28cory
Jul 21, 2002 9:30 PM
But how could you NOT? Think of the resistance when you just hold your hand out the window at 70, then imagine holding two or three bikes. In terms of what it costs, though, it's hardly worth worrying about. It's only a penny or so extra a mile.
It's nominal... I love my 'Big Mouth'!spyderman
Jul 21, 2002 10:27 PM
I thought my mileage would drop considerably, but it hasn't. You might notice it on long hauls, like on a vacation, but around town my mpg stays about the same.

Of course, when you change the aerodynamics of any vehicle, like increased drag, you will see a reduction in performance. Again it's nominal.