I am running in my pre reg 650 AM1, and it has now done about 500 miles. As with all my new ( to me) bikes I check the mpg. It is doing 65.7 mpg - taking it easy. When I was last running in a 650 V strom (AL5) in 2014 I got 80 mpg. This settled down to around 70 mpg after running in,which continued during my 4 yrs ownership, which was excellent. This current bike is doing 14.3 mpg less than my last one during running in. I sold that bike 3 yrs ago before E 10 petrol came in. Unless there is something substantially different about the engine, or fuel system on my current bike, which I doubt, it can only be be the E10 fuel responsible for the drop in mpg. Having said all that I am very pleased with the bike and delighted I have gone back to a V strom.