Change fuel consumption rate?
does anyone know how to change to fuel consumption rate its way faster than the ones that spawned on the road and it just eats low grade if this is not an option i get the whole nofuel cost option but you need to also need to have a an option to control the fuel consumption rate.

anyone know if u can do this?

Change your verison of code with this and hopefully that will work.  You probably would like a value in the config file, but this plugin is suppose to, I believe, be just a simple spawn in minicopter and go.     NOTE: There are 2 additions below!!

        private void SpawnMinicopter(BasePlayer player)
        {
            if (!player.IsBuildingBlocked() || _config.canSpawnBuildingBlocked)
            {
                RaycastHit hit;
                if (Physics.Raycast(player.eyes.HeadRay(), out hit, Mathf.Infinity, 
                    LayerMask.GetMask("Construction", "Default", "Deployed", "Resource", "Terrain", "Water", "World")))
                {
                    if (hit.distance > _config.maxSpawnDistance)
                    {
                        player.ChatMessage(lang.GetMessage("mini_sdistance", this, player.UserIDString));
                    }
                    else
                    {
                        Vector3 position = hit.point + Vector3.up * 2f;
                        BaseVehicle miniEntity = (BaseVehicle)GameManager.server.CreateEntity(_config.assetPrefab, position, new Quaternion());
                        miniEntity.OwnerID = player.userID;
                        miniEntity.health = _config.spawnHealth;
                        miniEntity.Spawn();     
                   
                       // addition 1: changed to modify fuel rate for base vehicle, but will revert back to 0.50f after server restart
                       MiniCopter minicopter = vehicleMini as MiniCopter;  
                        if (minicopter == null)
                              return;

                      minicopter.fuelPerSec = 0.25f;  
                      // end of addition 1

                     // End

                     _data.playerMini.Add(player.UserIDString, vehicleMini.net.ID);

                    if (permission.UserHasPermission(player.UserIDString, _noFuel))
                   {
                         // Addition 2 minicopter has already been created and initialized
                        // MiniCopter minicopter = vehicleMini as MiniCopter;
                        // End of Addtion 2

                            if (minicopter == null)
                                return;

                            minicopter.fuelPerSec = 0.0001f;

                            StorageContainer fuelContainer = minicopter.GetFuelSystem().GetFuelContainer();
                            ItemManager.CreateByItemID(-946369541, 300)?.MoveToContainer(fuelContainer.inventory);
                            fuelContainer.SetFlag(BaseEntity.Flags.Locked, true);
                        }

                        _data.playerMini.Add(player.UserIDString, miniEntity.net.ID);

                        if (!permission.UserHasPermission(player.UserIDString, _noCooldown))
                        {
                            foreach (var perm in _config.cooldowns)
                            {
                                if (_data.cooldown.ContainsKey(player.UserIDString))
                                    break;

                                if (permission.UserHasPermission(player.UserIDString, perm.Key))
                                    _data.cooldown.Add(player.UserIDString, DateTime.Now.AddSeconds(_config.cooldowns[perm.Key]));
                            }

                            /* Incase players don't have any cooldown permission default to one day */
                            if (!_data.cooldown.ContainsKey(player.UserIDString))
                                _data.cooldown.Add(player.UserIDString, DateTime.Now.AddDays(1));
                        }
                    }
                }
                else
                {
                    player.ChatMessage(lang.GetMessage("mini_terrain", this, player.UserIDString));
                }
            }
            else
            {
                player.ChatMessage(lang.GetMessage("mini_priv", this, player.UserIDString));
            }
        }

        private void SpawnMinicopter(string id)
        {
            // Use find incase they put their username
            BasePlayer player = BasePlayer.Find(id);

            if (player == null)
                return;

            if (_data.playerMini.ContainsKey(player.UserIDString))
            {
                player.ChatMessage(lang.GetMessage("mini_current", this, player.UserIDString));
                return;
            }

            // Credit Original MyMinicopter Plugin
            Quaternion rotation = player.GetNetworkRotation();
            Vector3 forward = rotation * Vector3.forward;
            Vector3 straight = Vector3.Cross(Vector3.Cross(Vector3.up, forward), Vector3.up).normalized;
            Vector3 position = player.transform.position + straight * 5f;
            position.y = player.transform.position.y + 2f;

            if (position == null) return;
            BaseVehicle vehicleMini = (BaseVehicle)GameManager.server.CreateEntity(_config.assetPrefab, position, new Quaternion());
            if (vehicleMini == null) return;
            vehicleMini.OwnerID = player.userID;
            vehicleMini.Spawn();

            // addition 1: changed to modify fuel rate for base vehicle, but will revert back to 0.50f after server restart
            MiniCopter minicopter = vehicleMini as MiniCopter;  
             if (minicopter == null)
                    return;

            minicopter.fuelPerSec = 0.25f;  
            // end of addition 1

            // End

            _data.playerMini.Add(player.UserIDString, vehicleMini.net.ID);

            if (permission.UserHasPermission(player.UserIDString, _noFuel))
            {
               // Addition 2 minicopter has already been created and initialized
              // MiniCopter minicopter = vehicleMini as MiniCopter;
              // End of Addtion 2

                if (minicopter == null)
                    return;

                minicopter.fuelPerSec = 0;

                StorageContainer fuelContainer = minicopter.GetFuelSystem().GetFuelContainer();
                ItemManager.CreateByItemID(-946369541, 300)?.MoveToContainer(fuelContainer.inventory);
                fuelContainer.SetFlag(BaseEntity.Flags.Locked, true);

                
            }
        }

Look for Addition 1 section in 2 different sections, something that shouldn't be.  Code should only be written once for easier and quicker maintenance upgrades.  

               // addition 1: changed to modify fuel rate for base vehicle, but will revert back to 0.50f after server restart
               MiniCopter minicopter = vehicleMini as MiniCopter;
                if (minicopter == null)
                      return;

              minicopter.fuelPerSec = 0.25f;
              // end of addition 1​



Change value:

 minicopter.fuelPerSec = 0.25f;

To what you are looking for, but understand that after a server restart the game will revert that value to 0.50f.  If want a change to revert back after restart let me know. I might be slow to respond, but I will.  

A good range should keep the value between 0.10 and 0.35.  If you wish to have tiers then that is possible to, but more code additions.