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Old 04-27-2016, 06:04 PM   #11 (permalink)
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A new study ... estimates that roof racks can cost drivers as much as 25 percent more in gas.
Challenge accepted? (Example: a steamer trunk on the aerocivic.)

Quote:
"For comparison, the additional fuel consumption caused by roof racks is about six times larger than anticipated fuel savings from fuel cell vehicles and 40 percent of anticipated fuel savings from battery electric vehicles in 2040," the researchers wrote.
Oh, come on. They'll have to show their work on this one.

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Old 04-30-2016, 02:34 PM   #12 (permalink)
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2 data points

CAR and DRIVER measured:
*1981 Ford Escort at 60-mph,with 12-cubic foot cargo carrier = 6-mpg loss.
*1982 VW Scirocco,with empty roof rack @ 55-mph = 13% mpg loss.
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Old 04-30-2016, 03:53 PM   #13 (permalink)
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6 is 13% of 46, but there's the 5mph difference.

Journalists!
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Old 04-30-2016, 04:16 PM   #14 (permalink)
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difference

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Originally Posted by freebeard View Post
6 is 13% of 46, but there's the 5mph difference.

Journalists!
Actually,we need the baseline for each vehicle so as to know the % difference for the Escort,and the mpg difference for the Scirocco.
And we'd have to make presumptions about rolling resistance and BSFC if we attempt to predict at a different velocity.
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Old 04-30-2016, 05:11 PM   #15 (permalink)
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Can we merge threads?
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Old 04-30-2016, 08:15 PM   #16 (permalink)
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I guess I have to do everything:

merge?
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Old 05-05-2016, 02:19 AM   #17 (permalink)
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It's an H2 so you might as well put a huge home made roof rack on it.
Custom H2 roof rack build
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Old 05-05-2016, 11:07 AM   #18 (permalink)
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What in the world is he planning on carrying up there?!
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Old 05-05-2016, 11:55 AM   #19 (permalink)
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Old 05-06-2016, 10:14 PM   #20 (permalink)
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I see more people using roof racks as an ornament than actually hauling something with it.

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