It would be nice if you could customize the stats (RPM, SU and burn rate) per fuel for each engine.

Also, the turbo upgrade should increase SU, not RPM, just like a real turbocharger does (Increases torque, not rpm)

https://github.com/george8188625/Create-Diesel-Generators/wiki/Customization#adding-custom-fuel-types
just override the default fuel types

Turbochargers will increase the stress capacity in 1.3

Hey, thank you. Just wondering if it is possible to override 2 fuels at the same time? No matter how I try, it only loads 1.
I have tried putting both the diesel and gasoline in 1 JSON, I have tried putting them each in their own JSON in the same datapack and I have tried 2 completely separate datapacks, 1 per fuel. None of these ways make it load both fuel overrides...

of course it's possible, just copy the fuel types from here and modify them
https://github.com/george8188625/Create-Diesel-Generators/tree/1.19.2/src/main/resources/data/createdieselgenerators/diesel_engine_fuel_types
it's possible that you just named the file incorrectly or used the wrong tag