"As Prius represents by far the biggest chunk of ... plug-ins and EVs are down around 5 percent for the year, but trucks and SUVs have seen a 17 and 20 percent improvement, respectively.
The fact that you had to plug in a purely electric car was a bad thing, but for a crop of Prius hackers it brings 20-140 mpg increase in the hybrid's gas saving abilities. People have been adding ...