Have you done that math? The "even if 100% efficient" doesn't sound right to me. Wouldn't that imply gas cooking is 25% efficient?
Admittedly, induction isn't 100% efficient, but it's very efficient! A gas flame heats up everything around it, whereas induction only heats up your cookware. The surface of an induction stove without any cookware is cool to the touch; in other cases, it's warm only due to the heat radiated back from your cookware.
