abstract
alternative
automobile
background
bio
business
car
clean
concept
design
diesel
eco
ecological
ecology
energy
environment
environmental
fuel
gas
gasoline
graphic
green
icon
identity
illustration
industry
leaf
logo
natural
nature
nozzle
oil
organic
petrol
petroleum
plant
power
pump
recycle
recycling
refueling
renewable
sign
station
symbol
technology
transport
transportation
vehicle