I'm sorry this is not true. How can you say there is no benefit to using high octane? Of course there is on a turbo car without a doubt! High octane fuel will not only improve fuel economy on a turbo car but also increase boost targets in modern turbo cars by adaption of the ecu, in other words will provide a slight increase in bhp and torque.
A few people have mentioned that there are mercs audis bmw's etc running just fine on our fuel but this civic won't work because it will sell in many more numbers??? What kind of logic is this? Let me get this right, you're saying that there will be a difference to individual engines based on how many units are soled?
Porsches run just fine here on our fuel. I think what people are not understanding about modern Ecu's is their ability to adapt very well to conditions such as fuel and climate. I'll say this again, don't worry about fuel issues, even standard will be fine with the civic and if you can access high octane great you might hit 0.5psi more boost if the ron is actually higher.
Let me give you an example, we had a partner in Germany with a completely stock nissan gtr take his car to the dyno one day with standard pump fuel then went the next week to the dyno again only difference was tank had 109 octane race fuel for a track day he was planning, the result....an extra 40hp from nothing but higher octane fuel, no tuning, no other parts nothing else.
So when you guys are saying the cars gonna knock, no it isn't! if the fuel ron is low the ecu will adjust values in real time and reduce boost in order to stay within a safety threshold. So yes its possible that your 173bhp engine might one day run 160 if you fill it with very poor low octane fuel and on another day run more than 173 if you get a good batch of high octane.
We have done some limited testing on local high octane fuel on the new audi a3 1.8tfsi and a6, we would like to do a lot more once we receive our car before we can post any conclusions and results.