I'm not sure how this spec fits in with Honda's current thinking?
Only a week ago, Honda announced that they believe America is just ready for a V8 product. Working on the basis that Honda will have projected that the USA is going to be the cars largest market, why have they decided on a V10? Honda's main links with the V10 engine is F1, which is about as relevant to the US market as diesel is.
Also take in to account Honda's sympathy with the environmental issue and fuel economy, does a V10 not send out the wrong signals? Surely a V8 is both commercially and practically a better option?
Using some rough calculations, using Honda's current technology it would be easy enough for them to produce 4 Litre V8 unit, producing around 480bhp with 30mpg capability during "normal" driving conditions.
The decision to use a front engined, rear drive configuration is also strange, although they appear to be following the trend set by the Lexus LFA, which is understandable as it will be the Honda's natural rival.
I know their motto is "Difficult is worth doing", but this is possibly a step too far.
It's all about the twisties....