The way I look at it is this way, if you had an ignition coil wrapped or wound for 4.8v input and 10,000v output and ran with a 4.8v battery, verses an ignition coil wrapped or wound for 6v input and 10,000v output ran on a 6v battery you should have 20% less current draw on the 6v coil. That takes the power loss(heat generated) from the regulator out, when 6v is dropped to 4.8v by the internal regulator! Am I right?