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Page 218 of manual details how to avoid this problem--For plug-in hybrid electric vehicles, fuel may remain in the tank for a long time and undergo changes in quality depending on the how the vehicle is used. Refuel at least 20 L(5.3 gal., 4.4 Imp.gal.) of fuel every 12 months (refuel a total of at least 20 L [5.3 gal., 4.4Imp.gal.] over a 12-month period), as this may affect components of the fuel system or the gasoline engine.
Page 218 of manual details how to avoid this problem--For plug-in hybrid electric vehicles, fuel may remain in the tank for a long time and undergo changes in quality depending on the how the vehicle is used. Refuel at least 20 L(5.3 gal., 4.4 Imp.gal.) of fuel every 12 months (refuel a total of at least 20 L [5.3 gal., 4.4Imp.gal.] over a 12-month period), as this may affect components of the fuel system or the gasoline engine.
That means that we need to use HV mode to deplete the gas once in a while or take a few longer trips
I've been using Seafaom gas treatment, at 1 ounce per gallon for over 20 years, never had any issues in motorcycles, small engines, or big vehicle engines. Strongly recommended.