I think KMA has an 85 300TD, not an 87 300D. IF that is correct, the MPG on the '85 will be mid/upper 20's at best, maybe 30 with a tailwind.
The 87 is much more efficient and has a significantly lower coefficient of drag. My 87 will also get 32-34mpg (peak), but my '84 can't get over 24-25 no matter what I do to it...
