This is a mod for Farming Simulator 19, Patch 1.3 or higher. This script sets the fuel consumption factors for motor vehicles. By default, this script sets the fuel consumption to 6 gallons per operating hour per 100 hp.
How to install FS19 mods?
Firstly find a mod which you like and want to download. Then download a mod to your PC. Mods are usually in .zip format file. But sometimes it can be in .rar. If a mod file is a .zip format no needed additional actions. If a file is in .rar, then you must unarchive mod with software like WinRar or Zip7. Windows 10 users no need to use software for archives, Win10 itself has a feature to unarchive files.
The next step is to find mods folder in your PC. Usually, it is in Documents/My Games/Farming Simulator 19/2019. Open the "mods" folder and put downloaded .zip archive or unarchived .rar file to this folder.
Last step. Enjoy of FS19 mods!
Everywhere this mod is announced as 1.0.0.0 – but if you unpack the zip where the real mod zip is in – yeah I know – then you see in the modDesc.xml that it’s 1.3.1.0.
It seems not to work anymore with FS 19 1.7.1.0 – the default fuel usage values are used.
I know that because I got a “Schlüter Super 1250 VL Special” which only got 150 hp but uses max. 122 liters of diesel per hour at max. load – defined in the mod’s .xml.
So the calculation of dxm_lua_fuelusage does not have higher priority than using the default value from the .xml.
Afaik there is nothing like a mod load order, but I can try to rename the mod with a leading Z in the filename.
Just a blind guess.