How do I get around the 250 point limitation for routes?

I'm not asking how I get more than 250 points.  That's obviously a limit.  But I have a trip that I put into my 700i and when I said "Go" it came back with route truncated.  And the last part of the trip had no path calculated or shown.  Just a heading to the final point.

The particular trip was 4200 miles.  WA to AR and back.  It had on'y 4 waypoints so all the other points were determined by the GPS.  Is there a way to say "make it fit and use points spaced further out" :)  I'm sure there is a way.  One way I thought of is just specifying 50 or less way points that give me the route. But there are still points in between the GPS uses and that still might give me the truncated route.

I suppose another way might be to split the route to the outbound route, and the return route.  But still wondering if there is another way that shows the whole route, within the 250 point limit.

How do I get the full route path, without exceeding the 250 point limit?

Thanks