auto
automobile
benzine
car
cost
crisis
diesel
dioxide
distribution
economy
emission
energy
environmental
expensive
fill
fossil
four
fuel
gallon
gas
gasoline
group
hazardous
horizontal
industry
motor
number
oil
paying
petrochemical
petrol
petroleum
pollution
power
price
pump
refill
refinery
refueling
resource
service
shine
station
tank
trading
transportation
up
vehicle