Suggestion archived due to a misunderstanding from the creating party.   X-RAY is the call-sign of helicopters for the LSPD and the fuel consumption rate is already much higher than a regular vehicle. Helicopters, at the moment, are restricted to flying at a certain altitude unless there are different circumstances, and just like in-real-life, you won't always hear the helicopter depending on the altitude.    Thanks for the suggestion, though. 
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