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Guardian: It's not green to fly your national colours

a few days into the Euro 2008 football championships fans are being advised not to fly their flags - because they could damage the environment. Engineers have declared that the flags, which are usually attached to window frames, cause wind resistance, which alters a car's aerodynamics and causes it to burn more fuel.

Austria's automobile club, the OAMTC, says attaching two flags to a car leads to an increased petrol consumption of "up to half a litre a kilometre on motorways and rural stretches".

Half a litre per kilometre?  That would give my car a range of about 80km.

Do you think they mean a half kilometre less per litre?

by Sassafras on Tue Jun 10th, 2008 at 06:47:19 PM EST
[ Parent ]
No, it means you would burn an additional 40 litres of fuel if you drove 80km with a flag.

When the capital development of a country becomes a by-product of the activities of a casino, the job is likely to be ill-done. — John M. Keynes
by Migeru (migeru at eurotrib dot com) on Wed Jun 11th, 2008 at 02:42:53 AM EST
[ Parent ]
Eh? A horribly inefficient vehicle making 10MPG = 4.23km/L = 0.24L/km, would with the addition of a small flag use 0.74L/km = 1.36km/L = 3.2MPG.

I don't believe it.

by someone (s0me1smail(a)gmail(d)com) on Wed Jun 11th, 2008 at 02:59:08 AM EST
[ Parent ]
That's what it says, yes.

But if I normally get 60mpg, that's about 20km per litre. So to drive 80km without a flag takes 4 litres.

A flag costs an additional 40 litres over that 80km????

I realise they aren't going to be talking about my car.  But it still seems a suspiciously high figure if talking about cars.  What did they test it on?  A Hummer full of bricks?

(Unless, of course, I've got Wednesday morning syndrome and my maths is screwed.)

by Sassafras on Wed Jun 11th, 2008 at 03:02:21 AM EST
[ Parent ]
35 litres is a full tank for me.

Have they change the design of these flags? I don't remember them being the size of a house and made of brightly painted depleted uranium.

by ThatBritGuy (thatbritguy (at) googlemail.com) on Wed Jun 11th, 2008 at 04:46:39 AM EST
[ Parent ]
I imagine it was an additional half liter per hundred kilometer, the standard unit. It means an increase of 10-15% in fuel consumption, which sounds plausible.

In the long run, we're all dead. John Maynard Keynes
by Jerome a Paris (etg@eurotrib.com) on Wed Jun 11th, 2008 at 06:45:34 AM EST
[ Parent ]
BTW does anyone have any figures on the weight/fuel cost of carrying a full tank of gas. Admittedly 40 litres is only approx 30 kilos, but when everyone keeps their tanks full 'in case the price goes up suddenly', there has to be some effect over millions of drivers?

You can't be me, I'm taken
by Sven Triloqvist on Wed Jun 11th, 2008 at 08:54:51 AM EST
[ Parent ]

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