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aal234

effect of air con on mpg?

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I have modified my engine so it only runs on 1 cylinder therefore I only use 1/4 of the fuel!!

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What engine? I have taken mine out and have put a sail on top of the roof.

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[ QUOTE ]

I have modified my engine so it only runs on 1 cylinder therefore I only use 1/4 of the fuel!!

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yelrotflmao.gif

Reminds me of a bad joke...

Irishman on a flight.... hears a bang, pilot comes on and says they've lost an engine, not to worry, plane can fly fine on two, will mean a bit of a delay though. After a while another bang and pilot says they've lost a second engine but not to worry, plane can fly perfectly well on one, but they'll be delayed some more. Irishman leans over and says to the passenger next to him: "Bloody hell! If we lose that last engine, we'll be up here all night!"

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Back on topic (sort of) I was flicking through my A3 manual and found this:

"The ambient temperature also has a major influence: fig. 229 shows the different consumption figures (ltr/100 km) for the same journey at +20C and at -10C. Your vehicle will always use more fuel in winter than in summer."

There you go. ha.gif

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I wouls assume tht the MPG would be better in the winter as there will be natural cooling of the condensing coil by means of the cold air blowing over the coil and the fact that the COP (Coefficient of performance) for heat pump systems tends to be higher (more efficient) on heating that that of cooling, therefore there should be less energy used on heating than on cooling.

On heating also you can expect air on coil temperatures much lower than you could get from the condensing fan, hence cooling the refrigerant in the system far more efficiently than when the condensing fan is operating, also there would be an influx of colder, more dense air mixing in the combustion chamber and thus a slight increase in power.

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I found a/c made no detectable difference in my Fiat Stilo. As for the the Audi, I haven't worked it out. But to be honest, I really can't be bothered. I just leave it on all the time as it prevents the windows misting up.

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