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Morph from one fuel to another, 12 letters
Dash item with E & F markings (3,5), 8 letters
Where F is highest on the scale, 8 letters
For '___' the student wrote 'ExxonMobil', 8 letters
Riot police weapon, 10 letters
Appliance that might use propane, 8 letters
Cooker with a propane tank, 8 letters
Car with low fuel efficiency, 10 letters
Car with poor mileage, 10 letters
Expensive choice for a commuter, 10 letters
Hardly economical transport, 10 letters
It's frequently filled up, 10 letters
Politically incorrect car, 10 letters
Politically incorrect vehicle, 10 letters
Vehicle with poor mileage, 10 letters