@Silver Sokolova I apologise for the bad explanation. You are correct that this mod and Betabound do not conflict; however, this mod will not work as intended with the fuel scaling in Betabound. The fuel price will not be 1/10 of what it will be if this mod is not installed, but -90.
For example: if the fuel cost for Betabound without this mod is 200, the fuel cost with this mod will not be 20, but 110. This is because the default fuel cost is added to the distance fuel cost when Betabound is calculating fuel scaling, not multiplied.
Again, I apologise if I explained this badly again. I like to think my english skill is somewhat improved, but it is not perfect.

I just tested it with Betabound and it works fine. Betabound does its fuel scaling by adding to whatever the default fuel price is based on distance- it doesn't actually touch the default fuel scaling value