(n) fossil fuel
(n) external combustion engine
(n,vs) (nuclear fuel) enrichment
(n) perfect combustion
(n) solid fuel
(n) solid fuel
(n) aviation fuel
(n) blended fuel
(n) internal-combustion engine
(n) fireproof
(n) cinders
(v5k,vi) to catch fire
to ignite
(v5r) (of fire) to spread
to extend itself
(n) embers
(n) embers
(v5s,vi) to catch fire
(v5r,vi) to blaze
to burn brightly
(v5k,vi) to catch fire
to ignite
(v5t,vi) to blaze up
to burn up
(n) fuel economy standards
(n) out of fuel
(n) fuel cell
(n) mixed oxide fuel
MOX fuel
(n) biofuel
(v5r,vi) to spread (flames)
(v5r,vi) to flare up
to burst into flames
(P)
(v1,vi) to burn out
(n) fuel-cell car
fuel-cell vehicle
(n,vs) incomplete combustion
(n) theoretical air fuel ratio