Except when you're driving at high speed, it's more fuel efficient
to use air conditioning than creating extra drag by opening the windows.
( Druid, Thu 11 Jun 2009, 18:55, archived)

You have to get to illegal speeds to make that happen

( Grrrmachine the indifference engine, Thu 11 Jun 2009, 18:56, archived)

I heard that it was about 40mph.
Which is illegal if you're driving in a 30mph limit.
( Druid, Thu 11 Jun 2009, 18:58, archived)

Grrrmachine is stuck in the 20th century.
He only knows about cars that backfire.
( Dave Trouser ; the people's choice - 75% agree, Thu 11 Jun 2009, 19:00, archived)

Given that the 2006 Subaru Forrester was prone to overfueling
pre-ignition and detonating its own throttle body clean off the manifold, that seems a bit harsh.
( Grrrmachine the indifference engine, Thu 11 Jun 2009, 19:02, archived)

In Soviet Russia, YOU backfire.

( Dave Trouser ; the people's choice - 75% agree, Thu 11 Jun 2009, 19:03, archived)

In a massively slippery sports car or similar where drag is a big issue, maybe
in your common or garden Octavia, you'd have to be talking about motorway speeds, and if was anything boxy like a van, it wouldn't make a difference at all.
( Grrrmachine the indifference engine, Thu 11 Jun 2009, 19:00, archived)

So not illegal speeds at all, then.

( Druid, Thu 11 Jun 2009, 19:02, archived)

next time you're on a motorway
I DARE you to stick to 69mph.
( Grrrmachine the indifference engine, Thu 11 Jun 2009, 19:09, archived)

What's wrong with 70?

( Dave Trouser ; the people's choice - 75% agree, Thu 11 Jun 2009, 19:09, archived)

It would depend on a lot of things, I'd imagine.
If it was one of these stupid SUV things that are shaped like bricks, it would probably make very little difference.
( Moon Girl Technologies horrendous beanbag, Thu 11 Jun 2009, 19:01, archived)