Same subject discussed in multiple car forums including the MX5OC (MX5 Owners Club).
I have JDM 93 1.8L Mk1 NA Eunos Roadster (Mazda MX-5 in Europe, Miata in US, etc) so followed the topic especially after Mazda announced that E10 is only suitable for 02+ Mazda cars.
Other European countries already had E10 for quite some time and in US, they were using the E10 for years now.
It was already at some of the pumps in early '90s.
As in previous thread as well as Honda Europe already stated, E10 is fine with all fuel injection controlled Honda models.
The majority of the fuel system components such as the fuel pump, tank, hoses, plastics, etc on our NSX are shared among different country specs.
So, if not compatible, by now, some NSX would have shown the side-effects in US.
I'll just keep using the super premium grade because for now, it will stay at E5.
More worried about my chainsaw and lawn mower so I may need going back to expensive alkylate petrol.
Kaz