The Magnuson-Moss Warranty Act of 1975 is a US federal law (15 U.S.C. ยง 2301). It applies to all consumer products, not just cars & bikes. In a nutshell, an OEM can only require you to visit them for service to keep your warranty valid if they provide the service free. If they don't provide it free, all you have to do is perform the required scheduled maintenance yourself (or have it done by someone else) and be able to back up what you say was done. A simple logbook and reciepts is good enough.
I'm guessing since Bobby mentions miles and a 50 Chevy truck, Bobby is an American.
As for your tire Q, there's a host of great tires out there, but one that's highly rated in "spirited" riding is not likely to be one that'll last long on the freeway, so you have to decide where you want to comprimise. Personally, I'm not scraping knee pucks and my tires exhibit 1/8-1/4" of chicken strips, so I find a sport-touring tire gives me plenty of confidence in the twisties, has good tread life and wet weather performance. I've been through two fronts and three rears of the old Michelin Pilot Roads and was pretty happy with them. At the end of last summer, I went with the new Pilot Road 2's and I'm loving them! They do everything better than the earlier versions so far. Time will tell if they get the same (or better) mileage.