Not Ranked
There are several things that are effecting your milage besides whether you drive with a lead foot or an egg under the pedal---restrictive small aircleaners ,exhaust systems that have the wrong tuned length, radical high rpm cams that are lugged around below there operating range, carbs and ignition that are dyno tuned for the big number----
That 5-600 hp dyno slip will give you 5-6 mpg---always has(406fe1962) up thru todays versions of similar engines---
If you want mpg get a modern set up with 300-350 inches and enjoy the DRIVE----if you to enjoy the RIDE ( yea, typical Cobra) throw in about $50 every 75 or 80 miles---
Jerry
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