Looks like Chevy has it then!
I have a '96 Caprice Classic (Body on frame design)
*LT1 (dynoed at 271hp and 345 ft/torque)
*14k trans cooler
*Heavy duty cooling
* Mobil 1 synthetics front to back
* Secondary electric fan temp lowered
*Upgraded air intake (K & N FIPK--all baffles removed)
*Upgraded MAFand air foil
*2000 Silverado trans pan (two additional quarts)
*Torque converter ram air cover (extra cooliing)
*Front air dams channeling air to the front rotors
*Moog rear cargo coils
In the future I will be placing 3.42 or 3.73 gears in the back and adding 17" Impala SS rims to replace the 15" rims currently installed.
This gets me about 10mpg highway pulling the Bambi. I normaly get about 21-22 without the Bambi.
As a side note the Envoy and Trailblazer now offer V8s (5.3L I think) in the EXT versions of the bodystyle.