A/C Usage and Impact on FE

[GasSavers_Scott]

My 02 Focus, 2.0, auto, really get a horsepower hit when I have the A/C on. Its Baltimore and its hot and humid and after getting heat stroke twice in my life, I know the value of A/C. Since I got rid of my factory cold air intake, I feed off the engine bay heat and I got about a 4 mpg boost from that, but lost my ability to claw over the hills. So when I drive I kick on the A/C down hill and off up hill. Some times I forget and turn it off while going up hill and I can feel the extra 6 or 8 horsepower it takes. So the A/C button is kind of a boost button for me.