Is there a graph that takes twisty roads into account?
Yes there is Wheatie, the Don Stanley seat of the pants Twisty-O-Meter. I now have 6K+ miles on my 2012 BMW K1600
GT "Gisele" and 60K+ miles on my 2003 Yamaha FJR 1300 "Lucy Liu"!
Here is the bottom line: Both machines will turn 11 second flat quarter miles and while Lucy has a top speed of 145mph, her sister Gisele has a top speed of 155mph. Once rolling, since they are both heavy machines, they are equally nimble on twisty roads; I had a great chance to test that out in Northern New Mexico last month as Ride Leader of SW-FOG.
Acceleration, handling, top speed and all other M/C factors are so similar between both machines I almost have to look at the paint color while rolling at speed to see which machine I am on. No kidding around, their performance factors are amazingly similar to each other!
There's a great price difference: I paid $22,500 for Gisele used three months ago and I paid $13,250 OTD new for Lucy in September, 2002. But, I started riding street March of 1965, 47 years ago, and I've never once let price be a factor in to which bike I'll be purchasing next!
I will be in Castlegar, Briitsh Columbia next June for NAFO / CFR 2012, Mark I invite you to try Gisele out; you will really be surprised how closely the two machines resemble each other; Gisele weighs 50 lbs. more, but she has 15 more horsepower. Both are great motos!