27MPG all the way back, though the V6 wasn't liking the climb out of Death Valley.
27 MPG In a Camaro? Even on flat roads without traffic, that's pretty amazing! Maybe the wind was at your back, and the bedframe was acting as a sail!
Wedge shape, cruise control, GM's excellent 700R4/4L60 automatic transmission and Sequential Fuel Injection. Hold a steady speed and keep your RPMs below 3K to take advantage of American torque-centric engine design.
The 3.4L V6 was just a mutant of the original 2.8L V6. Kinda shitty.
The 3800 Series II 3.8L V6 is incredible in the efficiency department. The 1999 Camaro I owned long before that would net me 31MPG. That one, however, was a 5-speed. When it got backed into and I was given an '01 Dodge Neon to drive during the repairs, I couldn't help laughing at the Neon's barely-30MPG economy. That car had the 3-speed automatic transmission, though. Good for a 0-60 of "yes".
Utah's not your average state. Between major cities, you're usually looking at a thirty mile drive. Look at that space station photo of nighttime lights over the USA and you'll see what I mean. Plenty of cruising space.