I did some researched. I have owned three bikes oer the years. They are compared to the Jag I drove and the one I will probably buy.
79 GS550 49hp, 430lbs 8.77lbs per hp
72 RD250 30hp, 335lbs 11.16lbs per hp
05 Vulcan 56hp, 540 lbs 9.64 lbs/hp
2011 XJL Supersport 4323lbs, 510hp 8.47 lbs/hp
2010 XF Supercharged 4306lbs, 470hp 9.16 lbs/hp
The XJL, which is the one I drove, has a better power to weight ratio than any of the bikes I owned.
The XF, which is the one I am looking to buy, beats two of the three.
Good thing I am not 20 and invulnerable.