I know, I know - most guys want to do the opposite of this for better torque or wheelies or whatever. I'm more interested in trying to maximize cruising economy given that 90% of my riding is freeway. Typically I'm running about 80-85 mph and turning 6,000-6,500 RPM. Back-of-the-envelope calculations show that if I were to go to +1 on the front and -1 on the rear, I could drop the RPM required for the same speed by about 300-500 RPM, with corresponding increases in fuel efficiency. This is assuming they even make these sprockets at all. Is this a nutty idea? Even plausible? Worth considering?

I believe the '99 750 Kat is a 15-front and a 45-rear but I'd have to verify this on my bike.

Has anyone actually done anything like this? Quick off-the-gun performance is far less important to me than economy/durability in the long-term. Hell, if I want to go fast, the bike has plenty of power and I can always drop it down one gear or jack the revs up a little higher, right?