There is a guy on another forum arguing that the chasis of a car is inferior to a 4ga copper wire as a ground.

He says that both power and ground should be ran the 17 ft to the battery for optimal conductivity.

For some reason I doubt that a copper cable with such a tiny volume/inch copper wire could conduct better than a massive steel chasis.

I know copper conducts better than steel but my issue is with volume of steel compared to copper. Theres just much more room and hence a lower resistance with the chasis.

Arguments?