Armchair theory - extreme cold air intake.

[Y@R15]

this is also true the A/C is only effiecent in the 60+MPH range. in this speed having the windows down would kill your MPG as well. what your talking about it trying to gain by saving. you cant gain power and MPG when you have the A/C on. now a way to i think see a little less fuel consuption would be to use an aftermarket A/C pulley. like the crank and altinator pulleys. other then that. your not gonna see anything by useing the A/C air... i think i confused myself.

[cfeng]

if someone tells me the mass flow rate of the air, or mass flow rate of the fuel, that passes through the engine, i can tell you how much more air can be consumed by an air conditioner operating 1.5-2 kw, cooling about 4-5 kw. i can approximate what power gains may be achieved.

correction to previous post, this would not be considered a forced induction at all, since pressure does not change due to cooling.

[djct_watt]

Just do a MPG check, one with AC always on and one without. Last time I did it, I saw almost a 5% reduction in MPG, so it should be close to the same in power draw. Don't forget that small numbers are usually within margin of error for dyno pulls.

Here's a link to a discussion about HP draw of an AC unit.
http://www.bobistheoilguy.com/forums...Number=1944982

[cali yaris]

I saw almost a 5% reduction in MPG, so it should be close to the same in power draw.

You're saying it's a 1:1 proportion of MPG to power? That doesn't sound right at all.

[djct_watt]

Originally Posted by cali yaris

You're saying it's a 1:1 proportion of MPG to power? That doesn't sound right at all.

I mis-phrased, lol. Definitely not 1:1.