Andrew,
  The Mudskipper clocks in at 71mph @ 4000rpm.  2.1L wasserboxer, 4spd manual
  box, 155000 miles on the odometer, full tank of gas, pilot only, level
  ground, sliders open, stereo cranked.  Michelin RainSomethings on 15"
  alloys, uh can't remember tire size but can pretty much guarantee the PO
  didn't biggie size them.  Note that I heed Boston Bob's advice and cruise no faster than 65mph
  (~3800rpm under same conditions) so as not to drive the block to an early
  death.  From here (Cambridge, MA) down to my folks (northern Jersey), I
  consistently get 25mpg @ 65mph.
Best,
d.
1990 GL -- "Mudskipper"

  ________________
 /                |
/                 |  --------
|                 |  ------
+-(  )------(  )--+  ---