Those that are seeing much less than 2 gal left when light comes on might want to check there dealer out. Normally most cars give over 2 gal reserve and the Honda owners manual states 2.8 US gal should be left at time light goes on.
might be defective float or arm got bent on install.
When I filled up my first tank the light didn't come on but I still had around 3 gals left, i see what next fill gives with light on.
