Until batteries or whatever other energy storage becomes lighter (and more cost effective), I want to see cars which use electric motors + range extender like the Mazda MX30 R-EV (or Chevrolet Volt or Fisker Karma… 🙃)
The problem is that these cars are a stopgap measure, and they're suboptimal hybrids (because of the weight).
For example, my Volt and Subaru Outback weigh almost the same (within one person's weight). They can get almost the same fuel economy, give or take 5 mpg).