I filled my DL650A yesterday morning and then pulled into the petrol station with everything flashing, indicating that the tank was almost empty. I had done 251 miles and mostly at speed sometimes 90mph (on a private road officer). The bikes maths told me I had done 51mpg average but when I worked it out the exact figure was 66mpg.
In my opinion that is good value for money, lots of smiles per gallon.