California already has stricter emissions standards than most states. You can't purchase a car in Oklahoma and register it in California without making modification to the emissions system.

If you ban gas stations instead in California, where will they fill up? The federal government has limited control over state land use regulation.

banning gas stations isn't a ban on new gas vehicles, it's a ban on all gas vehicles. very different, and the people will never vote for it until we are in a very different place than we are today.