Automotive Fuel Efficient

[hitechaes]

Fuel Efficient and Economical: Windows Down or A/C On?

Hi-Tech AES (Automotive Engineering Services)

 

[ninjaz]

Windows Up - A/C Off --> Most fuel efficient and economical

 

[IRstuff]

http://mythbustersresults.com/episode22

from ten years ago

TTFN
faq731-376

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[GregLocock]

I dare say "it depends".

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[LionelHutz]

Trying to win a bet or argument?

I too say it depends.

 

[inline6]

mythbusters did this IIRC. dont remember the outcome

 

[GregLocock]

They said a/c on, in their particular test, in their particular vehicle, on one particular day, was better. I somehow doubt that one test covers all vehicles and all duty cycles

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[winfieldblue]

Best economy is to have windows up and air-con off, if you're girlfriend complains about the excessively hot cabin try wetting her T-shirt with water. (be careful with this method, as often the following activities can result in an unwanted pregnancy which totally kills economy).

 

[yoshimitsuspeed]

Of course mythbusters is about as scientific as trying to measure the mass of dog farts with a tape measure.

 

[inline6]

given that the power to overcome drag is a function on velocity cubed defining the speed is a slightly important. it would be hard to imagine that opening the windows on a modern German car travelling on the autobahn at 120mph+ would use less fuel than a modern efficient A/C system. it is also hard to imagine that in bumper to bumper traffic of a few MPH that opening the windows would have any meaningful effect on fuel efficiency but the parasitic loss would be measurebable