KTM 390 Adventure 2020 Owner's Manual page 129

In some countries and regions, the available fuel quality and cleanliness may not be sufficient. This will result in
problems with the fuel system.
–
Refuel only with clean fuel that meets the specified standards. (Your authorized KTM workshop will be glad to
help.)
Note
Environmental hazard Improper handling of fuel is a danger to the environment.
–
Do not allow fuel to enter the groundwater, the soil, or the sewage system.
RIDING INSTRUCTIONS 10
127