Re: Tire options for 2008 HyHi.
HH06, purchased used Feb 09 after came off lease.
Replaced the OEM Michelin Energy LX4 (docs with car said this model came standard with car and apparently previous owner had just gone to Toyota and had same installed) with new Michelin Lattitude Tour "energy" tires.
Just completed 3000 mile vacation trip and unblievably quiet, no tracking on road grooves, great handling and mileage same or better than the LX4s (of course LX4s were down to wear bars.) Interestingly enough, these new tires also have 65K mile tread warranty.
Not inexpensive, but heartily recommend buying five at once so can rotate as Toyota recommends (F - R on left side) and (F - R - Spare on right side) because as my wife says (tire manager at large Sears Automotive Center in past life) right side tires get worst wear on a US driven car.