I'm on my 4th V-Strom, 3 of those are the DL1000.
The V2, in my experience gets about 5mpg less (at comparable speeds) than the other two DL1Ks I had.
On the first gen bikes, I rarely got below 42 at any speed, and on slower roads I would be 50, sometimes higher.
I don't get anything like that with the new bike.
Each bike had a K&N air filter, stock exhaust, and the same fat boy riding it.
FYI miles on each bike
2005 DL1000 - 58,000
2008 DL1000 - 98,000
2014 DL 650 - 10,200
2014 DL1000 - 24,000
My Alaskan Adventure