I think the E10 vs E5 issues and possible damage (long term) is not an understanding
issue as such. E10 on all accounts is more damaging to "some" vehicles that E5.
I think with the Barchetta there is little real clarity from Fiat UK/EU/WW.
Now it could be that all "B"s and all years can not run wit E10. But on the other hand we have CF3 / Euro 3 "B"s that supposedly, being Euro 3 etc. in theory/reported state info, should be OK on E10.
Of course all "B" owners should be assuming and using "E5" fuels only, But that said I hate, ....., the lack of true clarity and uncertainty. I was hoping (in my dreams) that we would have true chassis number related information. Even if I look on
ePER via chassis number CF3 seems to be a convergence point for older CF2 and CF3 vehicles when it comes to spare fuel system etc. parts. So no definitive clue here/there!
In reality the Italians (other than Ferrari) are basically "happy go lucky", "run it till it stops", "just enjoy what you have", "don't ask difficult questions", etc.
Enjoy ..... while it still runs!