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Air Conditioning In The Car.

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Tilly2 | 14:09 Fri 18th Jul 2014 | Cars
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Why does the car use up the petrol more quickly if you have the air conditioning on?

I have to keep putting petrol in. It's not lasting any time at all.
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That's better, gness. Large indeed.

Thaks, boxy. Is that Sunny Dave, do you think?
No, I think that's very-sunny dave....
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Ha!
You have actually raised a good point here, tilly - I noticed this morning that I need more fuel, I had a quarter of a tank the other day - I'd put it down to the petrol evaporating in the tank, in this heat.....
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Actually, gness, you've given me an idea. I could wrap some ice packs up in a carrier bag and sit on them. That might work.
...then when you get out, there's a big damp patch where you've been sitting. Not a good look :-(
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Does petrol evaporate in the heat? Lawks a mercy! I'll never have any money.
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Aww!
Well..if you get freezer burn I'm not rubbing in any ointment!
I will
No, I think I'm wrong in that assumption :-)
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Best not try that then. I hate ointments of any kind.
Alas...poor Shoota.... :-(
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I knew him, gness.
Get a horse, tilly.
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A horse, a horse...........I'd love a horse.
Do the sums though :

If you get (say) 40mpg in a modern car then you're paying about 15p per mile for petrol.

The absolute most that aircon will add is about 5% - unless you are stuck in stationary traffic for ages. Once you are over about 20mph the additional cost is actually negligible.

But let's assume the worst case of 5% - which means you are paying (at most) 0.75p per mile to be cool.

So a 20 mile trip will cost you a maximum of an extra 15p to avoid sweating like a [whatever] - that seems like a bargain to me.

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Thank you, Dave. I'll stop fretting about it now and turn the air-con on full blast.

Sorted.
it will use up petrol but like sunny dave I'm wondering if it will really be so much petrol that anyone would notice, as per your OP.
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Well, jno. I put some petrol in last Thursday and I had to put some more in yesterday.

The only thing was, I didn't have my purse with me and I had to 'borrow' £20.00 from one of my visitors. I wasn't expecting not to have any petrol. Maybe it does evaporate.

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