Judging/comparing Battery Performance

"We've all read about person X who does nothing more than plug in their converter and claims the batteries are just as good as new 6 years later, although this is an impossibility."

If you get phenomenal fuel economy and brag and brag about it, don't let me ride with you or borrow your vehicle. Karma, Voodoo, black cat, walking under a ladder time. You wouldn't believe how my presence de-tunes a motor vehicle.