[iceminion]

I just came from the garage, I have tried all sorts of heaters heres my review

Electric - Either worthless or fuse blower(wothless)
Kerosene - Quiet, minimal stink, not good enough for minnesota weather
Mr Heater(propane) - cheap cheap cheap, directional, lasts a long time
Torpedo - Works great, loud as shit, dont spray brake clean while in use
Corn - Jet is one smart motherfucker

Overall, insulation is the answer, no matter how much heat you have, if your garage leaks heat, you lose.