I have a Varadero 1000... that's not exactly frugal.
At the end of the day we're talking about litre+ bikes... fuel economy isn't really so much of a concern where your asking for more power.
None of my bikes have even been Euro anything when I've finished ripping off the stock cans, K&N filter and o2 eliminator.
100hp is enough in the real world.
You know what the say about Absolute Power and all that.