I've just run a few tanks of gas through my tintop 84 5 sp with new
Vredistein comtrac tires on the rear(2 wd).  These were pointed out by
Dennis...195/14 c , a commercial van tire.  They are fine at about $100
each from tires easy.com...free delivery.

  I have to agree with Scott, who's always suggested "c" rears and "d"
fronts...it does make the Vanagon handle well... The 195 size measures
about 6" more in circumference than the 205-70R 14 Go Form brand I took
off... approximately 10% higher gearing for my van...makes for more shifts
on the highway at speed as I "baby" my aging ABA Jetta motor by NOT lugging
it...55mph is now right at 3700rpm in 4th gear...so longer more substantial
hwy grades find me in 4th more often, while 5th is about 10% lower
revving... We'll see on fuel consumption, but I'm guessing it will decline
a little from my past 25~...mpg.