I've got a new Toyota Tundra and I hate to admit, but out of habit, I used my cruise control during several 30-50 mile highway trips during the break in period. I see the manual recommends not to drive constant speeds for extended periods. I've got about 400 miles on the clock now, and I'll pay extra close attention to my speeds over the next 600 miles. Should I be concerned about any potential issues due to my ignorance? Any advice or opinions are appreciated.