[marricks]

You don't understand what I'm saying. A 40 mpg Prius will always be a 40 mpg Prius. It's tied to the pump. It has to burn gas.

A Tesla will get more efficient as the grid gets more efficient because it only uses electricity. That also means when it runs on solar it will be impossible to beat against gas cars. Make sense? This is why we shouldn't settle for hybrids.

[ZeroGravitas]

You can now get a plug-in Prius. So, depending on how their mpg is calculated, cleaner electricity may have an effect. The batteries are still small, but the same argument that applies to short range EVs applies, most journeys are relatively short commutes, not long distance, and so plug in hybrids can spend a lot of time on electricity alone if they are topped up every time the reach home (and/or work).