[Konstantinos]

If you define vehicleid, then yes. Or:

pawn Код:

Carinfo[GetPlayerVehicleID(playerid)][F] += 5;

but make sure that the player who uses /usegc is driver because then passenger can get + fuel (abuse).

So change:

pawn Код:

if(!IsPlayerInAnyVehicle(playerid)) return SendClientMessage(playerid, COLOR_RED,"{FF6A22}INFO: {FFFFFF}You need to be in vehicle to use this command.");

to:

pawn Код:

if(GetPlayerState(playerid) != PLAYER_STATE_DRIVER) return SendClientMessage(playerid, COLOR_RED,"{FF6A22}INFO: {FFFFFF}You need to be in vehicle to use this command.");

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I'd also suggest you 2 more things:

Not using strcmp, use ZCMD or y_commands instead (speed)
For things that get only 2 values (0,1), use booleans. Boolean in combination of char in arrays reduces the size.