No sure what you mean by expensive. In my EU22i I use use a stabiliser (includes a corrosion inhibitor) which is distributed by Honda USA and made by Sta-Bil.
Sta-Bil is probably the largest manufacturer of this type of product around.
The small bottle I have will treat up to 300 litres for storage of up to 12 months.
Expensive is only relative when in the middle of the night you need to fire up your gene with a few pulls on the starter.
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