Exactly my point. 5 miles of variable driving is a hell of a lot different than 3-400 miles of highway driving on a new clock. You're not doing any part of the car any favors, from the engine to tranny and everything else. It's amusing people think that just bc they went against the curve and its working for them means they've figured out this great secret and it applies everywhere. You can do what you want to your car. But heed caution from any mechanic who tells you this isn't a wise choice. You do your car a better service in the beginning, your car will repay you in the long run. Varying your driving on a highway is not a substitute. That's all my two cents on the matter. You are completely free to do what you want to your own car.