HEV
Widespread adoption of PHEVs could reduce greenhouse gas emissions from cars by more than 450 million metric tons annually.
The new PHEV systems increase miles per gallon by 30 percent.
A PHEV with a petrol generator is likely to be much more efficient running on petrol than a regular car.

SMART Vocabulary: related words and phrases

Road vehicles in general
airboard
all-terrain vehicle
amphibian
ATV
autorickshaw
craft
diesel
gas-guzzling
HEV
HOV
hoverboard
hybrid
hybrid electric vehicle
motor vehicle
motorcade
rover
snow groomer
snowcat
vehicle
vehicular