I installed a fan in the garage to suck air from the garage and force it into the attic. This provides a two fold advantage, first it cools the garage, and second it forces to hot air out of the attic. To back this work you absolutely need adequate supply air to the garage. I did this by replacing the windows in the garage doors with screened vents. I think it works really well. As stated above you will find lots of comments. BTW the fan installation was around $100, the vents in the garage doors, about $120, and the approximate CFM of air being moved about 1000. Also, I use a thermostat to control the fan, only comes on when needed.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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