Fuel consumption

-- List of all gas stations in the world.
-- Update this list to include all gas station locations.
-- You can create a config file and read it from there, or just hard code as in this example.
GasStations = {
    {
        coords = vector3(64.55, 20.4, 68.9),  
        radius = 8
    }
}

-- Distance from point is the simplest way to determine if vehicle is at a gas station.
-- You can use polygons if you need more precision.
function IsPointInGasStation(point, gasStation)
    return #(point - gasStation.coords) <= gasStation.radius
end

-- Triggered when player enters gas station.
-- You can customize communication with a player the way you want.
function ProcessGasStationEnter(vehicle)
    -- Get current vehicle fuel level.
    local vehicleFuelLevel = GetVehicleFuelLevel(vehicle)
    -- Get vehicle petrol tank volume.
    local vehicleGasTankVolume = GetVehicleHandlingFloat(vehicle, "CHandlingData", "fPetrolTankVolume")
    -- Display basic text message.
    local gasStationMessage = string.format("Welcome to gas station. You have %.3f out of %.3f liters of fuel left. Press G to fill tank.", vehicleFuelLevel, vehicleGasTankVolume)
    AddTextEntry("CH_ALERT", gasStationMessage)
    BeginTextCommandDisplayHelp("CH_ALERT")
    EndTextCommandDisplayHelp(0, false, false, 200)
end

-- Fill up player's vehicle gas tank.
-- You can customize communication with a player the way you want.
function ProcessGasStationFuelPurchase(vehicle)
    -- Get vehicle petrol tank volume.
    local vehicleGasTankVolume = GetVehicleHandlingFloat(vehicle, "CHandlingData", "fPetrolTankVolume")
    -- Fill up the tank.
    SetVehicleFuelLevel(vehicle, vehicleGasTankVolume)
end

-- Checks if the specified vehicle is close to a gas station.
-- Caller must ensure that the vehicle exists.
function IsVehicleAtGasStation(vehicle)
    -- If the vehicle doesn't use fuel (i.e. a bicycle or with infinite fuel).
    if not DoesVehicleUseFuel(vehicle) then
        return false
    end

    -- Get coordinates of the vehicle and check that it's close enough to any of the gas stations.
    local vehicleCoords = GetEntityCoords(vehicle)
    for _, gasStation in ipairs(GasStations) do
        if IsPointInGasStation(vehicleCoords, gasStation) then
            return true
        end
    end
    return false
end

CreateThread(function()
    -- Main loop.
    while true do
        -- Do not add sleep time since this thread is operating with controls.
        Wait(0)

        -- Only run script if fuel consumption is turned on globally.
        if GetFuelConsumptionState() then

            -- Check if player is in a vehicle.
            local vehicle = GetVehiclePedIsIn(PlayerPedId(), false)
            if DoesEntityExist(vehicle) then

                if IsVehicleAtGasStation(vehicle) then

                    ProcessGasStationEnter(vehicle)

                    -- If G is pressed on a keyboard.
                    if IsControlPressed(0, 58) then
                        ProcessGasStationFuelPurchase(vehicle)
                    end
                end
            end
        end
    end
end)