I just got 26.5 mpg on my first highway trip after putting down 350rwhp. I just kept out of excessive boost, and boy am i proud.
year: 1988
transmission: r154
~rear end gear (other than stock): 3.93
mods (be detailed, turbo, inj, exhaust, etc.):upgraded ct-26, enough fuel for 16psi, 3" exhaust...