My two 410s used to average about 18 to the gallon over a single tank, but most of my mileage was fairly long distance with a fair bit of motorway. If commuting across London it could drop to about 15mpg but I don't remember much worse than that. On trips to France I could do as well as 20. One had a stock cam and Carter carb. The other a slightly hotter cam and Edelbrock carb. I was enjoying my driving and not making a great effort to save fuel, but not going berserk.
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