auto
automobile
background
barrel
business
car
commodity
conservation
consumer
cost
dependency
diesel
drive
economy
emission
energy
environment
expensive
filling
flammable
fuel
gallon
gas
gasoline
green
industry
isolated
journey
liter
motor
nozzle
oil
petrol
pollution
price
pump
refuel
refueling
resource
station
tank
transport
transportation
travel
trip
vehicle
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