Quote:
Originally Posted by MetroMPG
I have an external element style 300w OEM block heater + this convection tank style 800w one. I rarely use them both at the same time, unless I'm in a "hurry" and don't want to wait for the 800w one. 
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Since you have the equipment attached to your whip already, would you be willing to make another experiment and temperature every 15 minutes graph using the two heaters at the same time? I would really like to see how quickly it gets up to temp and how it affects your MPGs...
I really would like to do that kind of modification on my car...