I drove from Denver to Tyler, TX (and back)(2400miles) averaged 34.2mpg down the mountain, and 32.9mpg up back up to Denver. About 600 miles to a tank. Least problematic car I've ever owned, and can still haul 4 people rather comfortably. $2500 on craigslist. :)
Z's:
1990 TTZ 457 RWHP/441 FT/lb @18psi @ 5800' ALT November 07 436 RWHP/433 FT/lb @17psi @ 5300' ALT June 2006