Hi Kris;
4.5 K is ok for side streets, I normally do a 5.5K on the freeways in each
gear. RPM's are the only think keeping this thing going. To keep it
running at free way speeds change the oil every three months. If your
running it on both then you will want to think about an Oil Cooler setup.
Freeways seem to keep the engine running at a normal temp. 165- to- 190.
It's coming off the freeway that sends the temp way up.
The oil Cooler helps keep it running a whole bunch cooler.
Bill