My wife drives a 2006 Chrysler 300C. Yeah...its got a Hemi (340hp).  It has the cylinder displacement technology where it goes to 4 cyl on the highway.She gets around 20mpg (highway). One thing to note: my wife drives this car like an old lady to conserve gas. Lol
I drive a 00 Z-71 Silverado. Along time ago I checked the gas millage and got around 14-15mpg. I pulled a 24' enclosed trailer with my friends 62 impala loaded inside to a carshow and averaged 7-8mpg. 
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Brian
I know it's not a Chevelle. I still love Chevelles so I hope that counts for something! (70 Olds 442 W30)
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