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All answers having "Fuel" as clue:

3 Character Answers:

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GAS

JET

OIL



4 Character Answers:

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CELL

COAL

COKE

DELI

LOGS

PEAT



5 Character Answers:

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IVORY

STOKE



6 Character Answers:

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DIESEL

ETHANE

FAVOUR

PETROL



7 Character Answers:

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ECHELON

PEACOAL

RANCOUR

STOKEUP



8 Character Answers:

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FIREWOOD

GASOLINE

KEROSENE

PARAFFIN

SOFTCOAL



9 Character Answers:

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WHOLESOME



10 Character Answers:

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NATURALGAS



11 Character Answers:

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BEANCOUNTER