I'd be really surprised if there were a difference. The AC pulley is operated on an electric clutch, so it's not always engaged. When it's on, sure there's a load, but without it being engaged I'm fairly certian the difference is negligibleAce2cool wrote:Believe it or not, your engine will actually work better without the A/C belt. Faster revs due to less rotational mass. No A/C wouldn't really bug me, as I usually roll around with the windows down (even in 115* Lemoore heat). But most people wouldn't be able to stand it.