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Interesting...
I have a 557 with likely similar horsepower and a Holley 950 DP in a Zephyr station wagon. On a weekend where I run mostly highway miles, say up to 1,000 miles in three or four days, I get 12-13mpg.
Have you run it while checking with an 02 sensor/AF meter? Sounds as if it might be sucking some unnecessary dead dinosaurs.
It's possible you could do better, especially on the highway.
Tom
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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