We have E10 over here in Tunisia and have had for the last couple of years. I use it in a 27yr old K1100 with no issues at all. I get roughly the same per tank full as I did with the E5 fuel back in the UK and it's a whole lot cheaper to fill up here as opposed to back in the UK. It costs me around 30 Tunisian Dinars to fill up after about 200 miles which works out at less than £10 in the UK. The advantage over here i that the government set the max price per litre regardless of fuel supplier so there is loads of competition between fuel suppliers/stations to get customers onto the forecourt.