I ended up using Motorex Ethanol Treatment for the ZT-T and the 75 (and the F). Seems to do the job. Started with a "shock" treatment and now using it according to guidelines. Adds 0,02 € per liter and is a lot cheaper than '98 in the Netherlands (where fuel is the "new" liquid gold
).
From their website:
Quote:
Fuel additive that improves the properties of all fuels mixed with ethanol. Its properties reduce phase separation/separation, optimise fuel efficiency and reduce corrosion. Ensures that the engine runs more easily, removes deposits in the combustion chamber, regenerates old fuel and helps to remove water from the system.
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Product page:
https://motorex.com/en-us/ethanol-treatment--18802
Just my 0,02€ though