{
  "InitialFuelAmount": 1000,
  "ScrapHelicopterInitialFuelAmount": 1000
}

I've buy a minicopter and getting 400 low grade only...

I believe the way this plugin was implemented originally was to only reduce the fuel amount if higher than the specified amount, not increase it since the way it was originally coded could not tell the difference between vendor heli spawns and other spawns. That inaccuracy has since been fixed, so it should be easy to make the plugin able to increase the spawned fuel. I can submit a patch for this after work.

Thanks you for answer. Solved

My patch was accepted so Air Fuel v0.1.2 now provides helis with exactly the amount of fuel specified in the config, even if larger than 20% of max stack size.

Thanks very much ;)