1) Fuel for some trucks 2) Gas turbine fuel 3) Many buses use it 4) Need for certain trucks 5) Semi fill-up 6) Semi liquid 7) Semi lubricant 8) Truck-engine fuel 9) Type of fuel 
[n] - a heavy mineral oil used as fuel in diesel engines
diesel fuel noun a heavy mineral oil used as fuel in diesel engines
Lightweight fuel oil used in diesel engines. Like petrol, it is a petroleum product. When used in vehicle engines, it is also known as derv (diesel-engine road vehicle)