Answer:
Gas turbines in Helicopters require lesser space. 
Step-by-step explanation:
[1] In terms of Space Requirements: 
The gas used in helicopters requires lesser space as compared to Automotive gas turbines. The gas in automobile have higher thermal efficiency. 
[2]. In terms of Environmental impact: 
The occurrence of environmental solution is very slim when used in helicopters' engines. 
[3].  In terms of power-to-weight ratio:
The vibrations in engines of helicopters make it to have lesser efficiency as compared to automobile. 
[4]. In terms of Fuel availability:
Fuel is available. Automobile can make use of gas as fuel.