went to dealer to purchase a kickdown switch for my 84 sd. while there decided to apply for a high mileage badge as my 83 300td passed the 300k mile mark. noticed on the form provided that the badge is a 500k km. badge. or 312k miles. i was under the impression from my readings here that it was a 300k mile badge. do i have this confused.

oh, by the way. a 900+ mile trip last week from northern virginia to outer banks , north carolina, the 83 averaged a little over 32 mpg. lots of air in the tires - maybe 38 psi - and driving gently for the most part. i was suprised.

thank you.