Whatever your standard is for an "efficient" vehicle, more efficient things than those 15-20mpg trucks or SUVs do exist in the US. Every automaker sells a serious car that gets at least 30mpg combined if gas-only, or like 50mpg if hybrid.

The really wild part is you think that’s good.

You’ve never driven a BYD because your government blocks them. You’ve also never driven a fuel efficient car because they hardly exist in the US