Very much doubt we’ll see those MPG’s
Engineers are working on efficient, spark-free engines that could boost our cars a few more MPG’s. By clever management of the fuel and unrestricted air, and switching between spark-operated and sparkless mode, they solve a timing problem that has troubled sparkless engines.
It’s good news, but I doubt we’ll see the extra fuel economy. Since I started driving, engine power has just about doubled while gas mileage has stayed the same. So we know how improvements in engine design end up being used.