okay, but based on the fact that vin took down a bunch of mistings each as powerful in that ability as she was in that ability, the principle should be the same. also, should the amount of lerasium in the alloy being burned also make the same difference? Meaning, you would need to burn more of the alloy to get the same level of power as burning the pure thing.
Also, what's to say elend couldn't throw a car barehanded? He just never had a reason to use strength because he had steel. This doesn't seem unusual. Steel is less demanding than pewter!