[shovel]

If we are to make the assumption that everyone here is being somewhat fair and honest about their experiences, the remaining variable is the mechanical condition of the vehicle.

I say this because on both of my vehicles, one of which I use with a Scangauge and the other of which I just keep an eye on reciepts and odometer readings... E10 vs. 100% petrol comes out as a wash. Both vehicles run/idle/accelerate flawlessly on either fuel and miles per tank is consistent every single time no matter which fuel I fill up on, with exception made for unusual driving conditions (road trip, trailer being pulled, etc)

So, since both of my vehicles perform excellent on E10, this means it is possible for a vehicle to perform excellent on E10. That or I'm lying for some reason.. but the only person that will affect is you, since you can either work to correct what's wrong with your car and enjoy improved fuel versatility, or alternately you can shrug and say "that internet guy is full of sh@%" and keep having problems and blaming some liquid for them.