Voltage leaks are the result of your ignition system breaking down. Voltage leaks can occur anywhere in the secondary ignition system. The secondary ignition system is everything after the ignition coil output. Any leaks here can cause performance issues and poor MPG. Here’s a video on how to find voltage leaks. It’s kind of a fun test.
Video Title: Finding and Fixing the Causes of Poor MPG -Voltage Leaks Video Description: Voltage leaks here can cause performance issues and poor MPG. Thumbnail: http://www.ericthecarguy.com/images/faq_buttons/poor_MPG/Poor-MPG-icon-1200.jpg