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[Rods2]

Yet again a simple question in a thread has turned into a folks insisting that only "their" view is the correct one.

The world has a population of several billion, all of whom are entitled to an opinion... it behoves us all to accept that a) we are not always right, we can be wrong b) sometimes others are right, sometimes they are wrong, c) the fastest way of losing an argument is to resort to insults, d) quoting unsubstantiated "facts" just gets peoples backs up.....

To return to the OP's question .. it is my understanding (unsubstantiated) that the AC compressor is between 3 HP and 5 HP. The engine (my 3.2 V6) produces a fraction over 200 HP at max power, if we "assume" that we cruise using about 1/2 max power we are using around 100HP .... it seems logical therefore that the AC will use around 3-5 % of the available power, I would therefore think that the "extra" fuel used is also 3-5%.

Running on LPG costs me (on average over 55000 miles) 16 pence /mile in fuel (with the climate on auto all the time). It would appear that turning it off would save me a maximum of 5% more ... so reducing my costs to 15.2 pence /mile (saving 0.8 pence/mile).... but possibly not that much.

The Omega drag co-efficient was (and I believe still is) one of the lowest around.... there are several reports that opening the sunroof/windows increases the fuel burn by considerably more due to the vastly increased drag.

For those financial reasons I always have the climate on auto, I also just happen to think that being comfortable keeps me more alert and makes me a safer driver ... but that's just my opinion .. one out of several billion possibilities .... 

Most of the time you are probably only using 30-50hp when cruising. Obviously more when towing the tinbox.

You having independent thoughts and opinions sound very dangerous to me, where I thought to be a regular posting long standing member of OOF you have to strictly follow these two rules with all comments: 

1. I'm ALWAYS, but ALWAYS right.
2. When I'm wrong, see rule 1.

[05omegav6]

Don't forget Rule 3

Thinking that not telling SWMBO is a good idea is always a bad idea. She will find out, she won't approve, and will not be swayed. Ever.

[omega3000]

Rule 4

Hide the newly bought V8 in a mates garage 

[Mr.OmegaMan]

Rule 4

Hide the newly bought V8 in a mates garage 

Come Now Spill It ...................... 

[dbug]

Has Arolf come back having learned punctuation?

Grow up mate and don't be so argumentative

[tunnie]

I feel left out, what's gone on here?   

[Mr.OmegaMan]

Has Arolf come back having learned punctuation?

Grow up mate and don't be so argumentative

+1 Life's to short......

[dbug]

Has Arolf come back having learned punctuation?

Grow up mate and don't be so argumentative

+1 Life's to short......

Agreed 

[Mr.OmegaMan]

I feel left out, what's gone on here?   

Well it was supposed to be something about trying to work out how much extra fuel Air Con uses or saves, But now I've got the 3.2 working again i don't care its full on again 

But thinking about it and what others have said, When its hot obviously you either have to turn the Air Con on if you vehicle has it or open the windows usually more than one.. So MPG is hit either way with the drag of the windows open. But at higher speeds the drag would be so much Air Con would work out cheaper... Anyway's it's interesting 

[05omegav6]

Rule 4

Hide the newly bought V8 in a mates garage 

Rule 4 doesn't work see Rule 3 for details

I feel left out, what's gone on here?   

See replies 8 through 43, paying particular attention to reply 37