Oh I can assure you it's pretty well broken in! Many of those miles were pretty hard and also has quite a few miles of towing in the 100+ degree weather at 70-80 mph!
I figured it up and assuming a realistic 16 mpg average and $3.50 per gallon of gas, I have spend close to $9000 in gas since I have owned it! Not to mention my wife's car and the boat!